drivers: counter: Remove unused macros

CTIMER_CLOCK_SOURCE macros have been moved to
soc.c file.

Signed-off-by: Mahesh Mahadevan <mahesh.mahadevan@nxp.com>

drivers/counter/counter_mcux_ctimer.c

diff --git a/drivers/counter/counter_mcux_ctimer.c b/drivers/counter/counter_mcux_ctimer.c
index 302642f..934dd10 100644
--- a/drivers/counter/counter_mcux_ctimer.c
+++ b/drivers/counter/counter_mcux_ctimer.c
@@ -216,9 +216,6 @@
 	.get_top_value = mcux_lpc_ctimer_get_top_value,
 };
 
-#define CTIMER_CLOCK_SOURCE(id) TO_CTIMER_CLOCK_SOURCE(id, DT_INST_PROP(id, clk_source))
-#define TO_CTIMER_CLOCK_SOURCE(id, val) MUX_A(CM_CTIMERCLKSEL##id, val)
-
 #define COUNTER_LPC_CTIMER_DEVICE(id)                                                              \
 	static void mcux_lpc_ctimer_irq_config_##id(const struct device *dev);                     \
 	static struct mcux_lpc_ctimer_config mcux_lpc_ctimer_config_##id = { \