soc: silabs: Include series-specific Kconfig

The series-specific Kconfig files were not included, leading
to RTT not being considered available.

Fixes #75511.

Signed-off-by: Aksel Skauge Mellbye <aksel.mellbye@silabs.com>

soc/silabs/Kconfig

@@ -2,10 +2,10 @@
 # Copyright (c) 2018 Gil Benkoe
 # SPDX-License-Identifier: Apache-2.0
 
-rsource "*/*/Kconfig"
-
 if SOC_FAMILY_SILABS_S0 || SOC_FAMILY_SILABS_S1 || SOC_FAMILY_SILABS_S2
 
+rsource "*/Kconfig"
+
 config SOC_GECKO_SDID
 	int
 	help

soc/silabs/silabs_s0/Kconfig

@@ -5,3 +5,9 @@
 config SOC_FAMILY_SILABS_S0
 	select HAS_SEGGER_RTT if ZEPHYR_SEGGER_MODULE
 	select BUILD_OUTPUT_HEX
+
+if SOC_FAMILY_SILABS_S0
+
+rsource "*/Kconfig"
+
+endif # SOC_FAMILY_SILABS_S0

soc/silabs/silabs_s1/Kconfig

@@ -5,3 +5,9 @@
 config SOC_FAMILY_SILABS_S1
 	select HAS_SEGGER_RTT if ZEPHYR_SEGGER_MODULE
 	select BUILD_OUTPUT_HEX
+
+if SOC_FAMILY_SILABS_S1
+
+rsource "*/Kconfig"
+
+endif # SOC_FAMILY_SILABS_S1

soc/silabs/silabs_s2/Kconfig

@@ -5,3 +5,9 @@
 config SOC_FAMILY_SILABS_S2
 	select HAS_SEGGER_RTT if ZEPHYR_SEGGER_MODULE
 	select BUILD_OUTPUT_HEX
+
+if SOC_FAMILY_SILABS_S2
+
+rsource "*/Kconfig"
+
+endif # SOC_FAMILY_SILABS_S2