pinctrl: sprd: Fix the kconfig warning

On X86 plaform, if the CONFIG_OF is not selected, and set the
CONFIG_SPRD_SC9860 as 'm', that will cause below waring:

WARNING: unmet direct dependencies detected for PINCTRL_SPRD
Depends on [n]: PINCTRL [=y] && OF [=n] && (ARCH_SPRD || COMPILE_TEST [=y])
Selected by [m]:
- PINCTRL_SPRD_SC9860 [=m] && PINCTRL [=y]

Thus move the configuration dependency under CONFIG_PINCTRL_SPRD_SC9860
to fix the warning.

Reported-by: Randy Dunlap <[e-mail]>
Signed-off-by: Baolin Wang <[e-mail]>
Link: https://lore.kernel.org/r/eeb1[e-mail]
Acked-by: Randy Dunlap <[e-mail]> # build-tested
Signed-off-by: Linus Walleij <[e-mail]>

drivers/pinctrl/sprd/Kconfig

···
 #
 
 config PINCTRL_SPRD
-	tristate "Spreadtrum pinctrl driver"
-	depends on OF
-	depends on ARCH_SPRD || COMPILE_TEST
+	tristate
 	select PINMUX
 	select PINCONF
 	select GENERIC_PINCONF
···
 
 config PINCTRL_SPRD_SC9860
 	tristate "Spreadtrum SC9860 pinctrl driver"
+	depends on OF
+	depends on ARCH_SPRD || COMPILE_TEST
 	select PINCTRL_SPRD
 	help
 	  Say Y here to enable Spreadtrum SC9860 pinctrl driver