powerpc: do away with ARCH_[WANT_OPTIONAL|REQUIRE]_GPIOLIB

This replaces:

- "select ARCH_REQUIRE_GPIOLIB" with "select GPIOLIB" as this can
  now be selected directly.

- "select ARCH_WANT_OPTIONAL_GPIOLIB" with no dependency: GPIOLIB
  is now selectable by everyone, so we need not declare our
  intent to select it.

When ordering the symbols the following rationale was used:
if the selects were in alphabetical order, I moved select GPIOLIB
to be in alphabetical order, but if the selects were not
maintained in alphabetical order, I just replaced
"select ARCH_REQUIRE_GPIOLIB" with "select GPIOLIB".

Cc: Michael Büsch <m@bues.ch>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/powerpc/platforms/86xx/Kconfig

@@ -4,7 +4,6 @@ menuconfig PPC_86xx
 	depends on 6xx
 	select FSL_SOC
 	select ALTIVEC
-	select ARCH_WANT_OPTIONAL_GPIOLIB
 	help
 	  The Freescale E600 SoCs have 74xx cores.
 
@@ -37,7 +36,7 @@ config GEF_PPC9A
 	bool "GE PPC9A"
 	select DEFAULT_UIMAGE
 	select MMIO_NVRAM
-	select ARCH_REQUIRE_GPIOLIB
+	select GPIOLIB
 	select GE_FPGA
 	help
 	  This option enables support for the GE PPC9A.
@@ -46,7 +45,7 @@ config GEF_SBC310
 	bool "GE SBC310"
 	select DEFAULT_UIMAGE
 	select MMIO_NVRAM
-	select ARCH_REQUIRE_GPIOLIB
+	select GPIOLIB
 	select GE_FPGA
 	help
 	  This option enables support for the GE SBC310.
@@ -55,7 +54,7 @@ config GEF_SBC610
 	bool "GE SBC610"
 	select DEFAULT_UIMAGE
 	select MMIO_NVRAM
-	select ARCH_REQUIRE_GPIOLIB
+	select GPIOLIB
 	select GE_FPGA
 	select HAS_RAPIDIO
 	help