powerpc: drop unneeded dependency on OF_GPIO

OF_GPIO is automatically enabled on all OF systems. There's no need to
select it explicitly.

Reviewed-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
Link: https://patch.msgid.link/20260304-gpio-of-kconfig-v1-3-d597916e79e7@oss.qualcomm.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>

Author: Bartosz Golaszewski

arch/powerpc/platforms/85xx/Kconfig

@@ -217,7 +217,6 @@ config GE_IMP3A
 config SGY_CTS1000
 	tristate "Servergy CTS-1000 support"
 	select GPIOLIB
-	select OF_GPIO
 	depends on CORENET_GENERIC
 	help
 	  Enable this to support functionality in Servergy's CTS-1000 systems.