sh: Enable optional gpiolib for all CPUs with pinmux tables.

All of the CPUs with pinmux tables support gpiolib. At present the boards
that depend on it for initialization manually select gpiolib as needed,
but there is no reason why it can't be exposed generically to the user
regardless.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/Kconfig

@@ -274,6 +274,7 @@ config CPU_SUBTYPE_SH7203
 	select CPU_HAS_FPU
 	select SYS_SUPPORTS_CMT
 	select SYS_SUPPORTS_MTU2
+	select ARCH_WANT_OPTIONAL_GPIOLIB
 
 config CPU_SUBTYPE_SH7206
 	bool "Support SH7206 processor"
@@ -345,6 +346,7 @@ config CPU_SUBTYPE_SH7720
 	select CPU_SH3
 	select CPU_HAS_DSP
 	select SYS_SUPPORTS_CMT
+	select ARCH_WANT_OPTIONAL_GPIOLIB
 	help
 	  Select SH7720 if you have a SH3-DSP SH7720 CPU.
 
@@ -407,6 +409,7 @@ config CPU_SUBTYPE_SH7723
 	select ARCH_SHMOBILE
 	select ARCH_SPARSEMEM_ENABLE
 	select SYS_SUPPORTS_CMT
+	select ARCH_WANT_OPTIONAL_GPIOLIB
 	help
 	  Select SH7723 if you have an SH-MobileR2 CPU.
 
@@ -417,6 +420,7 @@ config CPU_SUBTYPE_SH7724
 	select ARCH_SHMOBILE
 	select ARCH_SPARSEMEM_ENABLE
 	select SYS_SUPPORTS_CMT
+	select ARCH_WANT_OPTIONAL_GPIOLIB
 	help
 	  Select SH7724 if you have an SH-MobileR2R CPU.
 
@@ -424,6 +428,7 @@ config CPU_SUBTYPE_SH7757
 	bool "Support SH7757 processor"
 	select CPU_SH4A
 	select CPU_SHX2
+	select ARCH_WANT_OPTIONAL_GPIOLIB
 	help
 	  Select SH7757 if you have a SH4A SH7757 CPU.
 
@@ -447,6 +452,7 @@ config CPU_SUBTYPE_SH7785
 	select CPU_SHX2
 	select ARCH_SPARSEMEM_ENABLE
 	select SYS_SUPPORTS_NUMA
+	select ARCH_WANT_OPTIONAL_GPIOLIB
 
 config CPU_SUBTYPE_SH7786
 	bool "Support SH7786 processor"
@@ -454,6 +460,7 @@ config CPU_SUBTYPE_SH7786
 	select CPU_SHX3
 	select CPU_HAS_PTEAEX
 	select GENERIC_CLOCKEVENTS_BROADCAST if SMP
+	select ARCH_WANT_OPTIONAL_GPIOLIB
 
 config CPU_SUBTYPE_SHX3
 	bool "Support SH-X3 processor"
@@ -478,6 +485,7 @@ config CPU_SUBTYPE_SH7722
 	select ARCH_SPARSEMEM_ENABLE
 	select SYS_SUPPORTS_NUMA
 	select SYS_SUPPORTS_CMT
+	select ARCH_WANT_OPTIONAL_GPIOLIB
 
 config CPU_SUBTYPE_SH7366
 	bool "Support SH7366 processor"