soc: arm: nordic_nrf: move NRF_RTC_TIMER not to be selected as default

NRF_RTC_TIMER will not be a default timer in the next
version of Nordic timer. It should be soc selection specific.

Signed-off-by: Witold Lukasik <witold.lukasik@nordicsemi.no>

soc/arm/nordic_nrf/Kconfig.defconfig

@@ -7,15 +7,12 @@ if SOC_FAMILY_NRF
 
 source "soc/arm/nordic_nrf/*/Kconfig.defconfig.series"
 
-# If the kernel has timer support, enable both clock control and timer
+# If the kernel has timer support, enable clock control
 if SYS_CLOCK_EXISTS
 
 config CLOCK_CONTROL
 	default y
 
-config NRF_RTC_TIMER
-	default y
-
 endif # SYS_CLOCK_EXISTS
 
 config SYS_CLOCK_HW_CYCLES_PER_SEC

soc/arm/nordic_nrf/nrf51/Kconfig.defconfig.series

@@ -14,4 +14,8 @@ config SOC_SERIES
 config NUM_IRQS
 	default 26
 
+# If the kernel has timer support, enable the timer
+config NRF_RTC_TIMER
+	default y if SYS_CLOCK_EXISTS
+
 endif # SOC_SERIES_NRF51X

soc/arm/nordic_nrf/nrf52/Kconfig.defconfig.series

@@ -10,4 +10,8 @@ source "soc/arm/nordic_nrf/nrf52/Kconfig.defconfig.nrf52*"
 config SOC_SERIES
 	default "nrf52"
 
+# If the kernel has timer support, enable the timer
+config NRF_RTC_TIMER
+	default y if SYS_CLOCK_EXISTS
+
 endif # SOC_SERIES_NRF52X

soc/arm/nordic_nrf/nrf53/Kconfig.defconfig.series

@@ -10,4 +10,8 @@ source "soc/arm/nordic_nrf/nrf53/Kconfig.defconfig.nrf53*"
 config SOC_SERIES
 	default "nrf53"
 
+# If the kernel has timer support, enable the timer
+config NRF_RTC_TIMER
+	default y if SYS_CLOCK_EXISTS
+
 endif # SOC_SERIES_NRF53X

soc/arm/nordic_nrf/nrf91/Kconfig.defconfig.series

@@ -10,4 +10,8 @@ source "soc/arm/nordic_nrf/nrf91/Kconfig.defconfig.nrf91*"
 config SOC_SERIES
 	default "nrf91"
 
+# If the kernel has timer support, enable the timer
+config NRF_RTC_TIMER
+	default y if SYS_CLOCK_EXISTS
+
 endif # SOC_SERIES_NRF91X