soc: rw: Consolidate clock cycle kconfig.

No need for this to be expanded out so much.

Signed-off-by: Declan Snyder <declan.snyder@nxp.com>
diff --git a/soc/nxp/rw/Kconfig.defconfig b/soc/nxp/rw/Kconfig.defconfig
index 3d9f891..284c5e7 100644
--- a/soc/nxp/rw/Kconfig.defconfig
+++ b/soc/nxp/rw/Kconfig.defconfig
@@ -10,19 +10,9 @@
 config NUM_IRQS
 	default 129
 
-if MCUX_OS_TIMER
-
 config SYS_CLOCK_HW_CYCLES_PER_SEC
-	default 1000000
-
-endif # MCUX_OS_TIMER
-
-if CORTEX_M_SYSTICK
-
-config SYS_CLOCK_HW_CYCLES_PER_SEC
-	default 260000000
-
-endif # CORTEX_M_SYSTICK
+	default 1000000 if MCUX_OS_TIMER
+	default 260000000 if CORTEX_M_SYSTICK
 
 if BT