of: remove architecture CONFIG_OF definitions

now that CONFIG_OF is defined globally

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Acked-by: Michal Simek <monstr@monstr.eu>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index 2b378205..1a8f682 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -126,9 +126,6 @@
 	  Set this to have arguments from the default kernel command string
 	  override those passed by the boot loader.
 
-config OF
-	bool
-
 config PROC_DEVICETREE
 	bool "Support for device tree in /proc"
 	depends on PROC_FS
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 3697231..402f4c0 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -174,9 +174,6 @@
 config PPC_OF
 	def_bool y
 
-config OF
-	bool
-
 config PPC_UDBG_16550
 	bool
 	default n
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index d02e8ac..13a9f2f 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -149,9 +149,6 @@
 config ARCH_NO_VIRT_TO_BUS
 	def_bool y
 
-config OF
-	bool
-
 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
 	def_bool y if SPARC64