drivers: spi: spi_stm32: Convert DT_COMPAT_ define usage to new macros

Convert driver from using DT_COMPAT_ST_STM32_SPI_FIFO to new macro
DT_HAS_COMPAT(st_stm32_spi_fifo).

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
diff --git a/drivers/spi/spi_ll_stm32.c b/drivers/spi/spi_ll_stm32.c
index fff9f4b..85b2c90 100644
--- a/drivers/spi/spi_ll_stm32.c
+++ b/drivers/spi/spi_ll_stm32.c
@@ -197,7 +197,7 @@
 
 	spi_context_cs_control(&data->ctx, false);
 
-#if defined(DT_COMPAT_ST_STM32_SPI_FIFO)
+#if DT_HAS_COMPAT(st_stm32_spi_fifo)
 	/* Flush RX buffer */
 	while (ll_func_rx_is_not_empty(spi)) {
 		(void) LL_SPI_ReceiveData8(spi);
@@ -344,7 +344,7 @@
 		LL_SPI_SetDataWidth(spi, LL_SPI_DATAWIDTH_16BIT);
 	}
 
-#if defined(DT_COMPAT_ST_STM32_SPI_FIFO)
+#if DT_HAS_COMPAT(st_stm32_spi_fifo)
 	ll_func_set_fifo_threshold_8bit(spi);
 #endif
 
@@ -409,7 +409,7 @@
 	/* Set buffers info */
 	spi_context_buffers_setup(&data->ctx, tx_bufs, rx_bufs, 1);
 
-#if defined(DT_COMPAT_ST_STM32_SPI_FIFO)
+#if DT_HAS_COMPAT(st_stm32_spi_fifo)
 	/* Flush RX buffer */
 	while (ll_func_rx_is_not_empty(spi)) {
 		(void) LL_SPI_ReceiveData8(spi);