drivers: spi: use dedicated init priority

A couple of SPI drivers use CONFIG_KERNEL_INIT_PRIORITY_DEVICE
as init priority for driver initialization. Let's change
it to the dedicated CONFIG_SPI_INIT_PRIORITY to make it
compatible with other ones.

Signed-off-by: Bartosz Bilas <bartosz.bilas@hotmail.com>
diff --git a/drivers/spi/spi_b91.c b/drivers/spi/spi_b91.c
index 7e7da5e..89908c7 100644
--- a/drivers/spi/spi_b91.c
+++ b/drivers/spi/spi_b91.c
@@ -474,7 +474,7 @@
 			      &spi_b91_data_##inst,				\
 			      &spi_b91_cfg_##inst,				\
 			      POST_KERNEL,					\
-			      CONFIG_KERNEL_INIT_PRIORITY_DEVICE,		\
+			      CONFIG_SPI_INIT_PRIORITY,				\
 			      &spi_b91_api);
 
 DT_INST_FOREACH_STATUS_OKAY(SPI_B91_INIT)
diff --git a/drivers/spi/spi_esp32_spim.c b/drivers/spi/spi_esp32_spim.c
index c9c4fda..1079f8e 100644
--- a/drivers/spi/spi_esp32_spim.c
+++ b/drivers/spi/spi_esp32_spim.c
@@ -455,7 +455,7 @@
 	DEVICE_DT_DEFINE(DT_NODELABEL(spi##idx), &spi_esp32_init,	\
 			      NULL, &spi_data_##idx,	\
 			      &spi_config_##idx, POST_KERNEL,	\
-			      CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &spi_api);
+			      CONFIG_SPI_INIT_PRIORITY, &spi_api);
 
 #if DT_NODE_HAS_STATUS(DT_NODELABEL(spi2), okay)
 ESP32_SPI_INIT(2);
diff --git a/drivers/spi/spi_mcux_flexcomm.c b/drivers/spi/spi_mcux_flexcomm.c
index 7e4f662..7f882b4 100644
--- a/drivers/spi/spi_mcux_flexcomm.c
+++ b/drivers/spi/spi_mcux_flexcomm.c
@@ -770,7 +770,7 @@
 			    &spi_mcux_data_##id,			\
 			    &spi_mcux_config_##id,			\
 			    POST_KERNEL,				\
-			    CONFIG_KERNEL_INIT_PRIORITY_DEVICE,		\
+			    CONFIG_SPI_INIT_PRIORITY,			\
 			    &spi_mcux_driver_api);			\
 	\
 	SPI_MCUX_FLEXCOMM_IRQ_HANDLER(id)
diff --git a/drivers/spi/spi_mcux_lpspi.c b/drivers/spi/spi_mcux_lpspi.c
index faed79c..138f2cd 100644
--- a/drivers/spi/spi_mcux_lpspi.c
+++ b/drivers/spi/spi_mcux_lpspi.c
@@ -306,7 +306,7 @@
 	DEVICE_DT_INST_DEFINE(n, &spi_mcux_init, NULL,			\
 			    &spi_mcux_data_##n,				\
 			    &spi_mcux_config_##n, POST_KERNEL,		\
-			    CONFIG_KERNEL_INIT_PRIORITY_DEVICE,		\
+			    CONFIG_SPI_INIT_PRIORITY,			\
 			    &spi_mcux_driver_api);			\
 									\
 	static void spi_mcux_config_func_##n(const struct device *dev)	\
diff --git a/drivers/spi/spi_rv32m1_lpspi.c b/drivers/spi/spi_rv32m1_lpspi.c
index 3492903..b99d3c3 100644
--- a/drivers/spi/spi_rv32m1_lpspi.c
+++ b/drivers/spi/spi_rv32m1_lpspi.c
@@ -299,7 +299,7 @@
 			    &spi_mcux_data_##n,				\
 			    &spi_mcux_config_##n,			\
 			    POST_KERNEL,				\
-			    CONFIG_KERNEL_INIT_PRIORITY_DEVICE,		\
+			    CONFIG_SPI_INIT_PRIORITY,			\
 			    &spi_mcux_driver_api);			\
 									\
 	static void spi_mcux_config_func_##n(const struct device *dev)	\
diff --git a/drivers/spi/spi_xlnx_axi_quadspi.c b/drivers/spi/spi_xlnx_axi_quadspi.c
index 2e1e990..e7063ca 100644
--- a/drivers/spi/spi_xlnx_axi_quadspi.c
+++ b/drivers/spi/spi_xlnx_axi_quadspi.c
@@ -481,7 +481,7 @@
 			    NULL,					\
 			    &xlnx_quadspi_data_##n,			\
 			    &xlnx_quadspi_config_##n, POST_KERNEL,	\
-			    CONFIG_KERNEL_INIT_PRIORITY_DEVICE,		\
+			    CONFIG_SPI_INIT_PRIORITY,			\
 			    &xlnx_quadspi_driver_api);			\
 									\
 	static void xlnx_quadspi_config_func_##n(const struct device *dev)	\