memblock: kill "config MAX_ACTIVE_REGIONS"

The Kconfig symbol MAX_ACTIVE_REGIONS is unused. Commit
0ee332c1451869963626bf9cac88f165a90990e1 ("memblock: Kill
early_node_map[]") removed the only place were it was actually used. But
it did not remove its Kconfig entries (for powerpc and sh).

Remove those two entries (and the entry for metag, that popped up in
v3.9-rc1).

Signed-off-by: Paul Bolle <[e-mail]>
Acked-by: Paul Mundt <[e-mail]>
Acked-by: James Hogan <[e-mail]>
Signed-off-by: Michael Ellerman <[e-mail]>

arch/metag/mm/Kconfig

···
 config ARCH_SPARSEMEM_DEFAULT
 	def_bool y
 
-config MAX_ACTIVE_REGIONS
-	int
-	default "2" if SPARSEMEM
-	default "1"
-
 config ARCH_POPULATES_NODE_MAP
 	def_bool y
 

arch/powerpc/Kconfig

···
 	default "4"
 	depends on NEED_MULTIPLE_NODES
 
-config MAX_ACTIVE_REGIONS
-	int
-	default "256" if PPC64
-	default "32"
-
 config ARCH_SELECT_MEMORY_MODEL
 	def_bool y
 	depends on PPC64

arch/sh/mm/Kconfig

···
 config ARCH_SPARSEMEM_DEFAULT
 	def_bool y
 
-config MAX_ACTIVE_REGIONS
-	int
-	default "6" if (CPU_SUBTYPE_SHX3 && SPARSEMEM)
-	default "2" if SPARSEMEM && (CPU_SUBTYPE_SH7722 || \
-		       CPU_SUBTYPE_SH7785)
-	default "1"
-
 config ARCH_SELECT_MEMORY_MODEL
 	def_bool y