drivers: clock_control: beetle: convert to DT_INST defines

Convert driver to use DT_INST_ defines.

Signed-off-by: Kumar Gala <[email protected]>

Author: galak

drivers/clock_control/beetle_clock_control.c

@@ -233,7 +233,7 @@ static int beetle_clock_control_init(struct device *dev)
 
 static const struct beetle_clock_control_cfg_t beetle_cc_cfg = {
 	.clock_control_id = 0,
-	.freq = DT_ARM_CORTEX_M3_0_CLOCK_FREQUENCY,
+	.freq = DT_INST_0_ARM_CORTEX_M3_CLOCK_FREQUENCY,
 };
 
 /**