kconfigcheck: add PPP specific section (MR 5992)

CONFIG_LEDS_GROUP_MULTICOLOR just had to be re-enabled to fix a
regression. Add this to kconfigcheck to prevent disabling it by
accident in the future. Adjust the description of the Librem 5
specific section while at it.

[ci:skip-build] [ci:skip-vercheck]: no need to rebuild

device/community/linux-pine64-pinephonepro/APKBUILD

@@ -12,6 +12,7 @@ license="GPL-2.0-only"
 options="!strip !check !tracedeps
 	pmb:cross-native
 	pmb:kconfigcheck-community
+	pmb:kconfigcheck-pinephonepro
 	"
 makedepends="
 	bash

kconfigcheck.toml

@@ -490,6 +490,8 @@ VIRTUALIZATION = true
 DYNAMIC_DEBUG = true  # Enable debug dynamically
 DYNAMIC_FTRACE = true  # Enable function tracing dynamically
 
-# librem5: Specific to the Purism Librem 5
+# Device specific settings to prevent regressions
 ["category:librem5".">=0.0.0"."aarch64"]
-RS9116_FLASH_MODE = false
+RS9116_FLASH_MODE = false  # pma!2059
+["category:pinephonepro".">=0.0.0"."aarch64"]
+LEDS_GROUP_MULTICOLOR = true  # pma!5991