ARM: realtek: MAINTAINERS: Include pin controller drivers

ARM: realtek: MAINTAINERS: Include pin controller drivers

No dedicated maintainers are shown for Realtek SoC pin controllers,
except pinctrl subsystem maintainer, which means reduced review and
impression of abandoned drivers.  Pin controller drivers are essential
part of an SoC, so in case of lack of dedicated entry at least cover it
by the SoC platform maintainers.

Acked-by: Yu-Chun Lin <eleanor.lin@realtek.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Yu-Chun Lin <eleanor.lin@realtek.com>
Link: https://lore.kernel.org/r/20260505105838.1014771-2-eleanor.lin@realtek.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>