C6X: remove unused config items

Signed-off-by: Mark Salter <msalter@redhat.com>

arch/c6x/Kconfig

@@ -19,24 +19,12 @@ config C6X
 config MMU
 	def_bool n
 
-config ZONE_DMA
-	def_bool y
-
 config FPU
 	def_bool n
 
-config HIGHMEM
-	def_bool n
-
-config NUMA
-	def_bool n
-
 config RWSEM_GENERIC_SPINLOCK
 	def_bool y
 
-config RWSEM_XCHGADD_ALGORITHM
-	def_bool n
-
 config GENERIC_CALIBRATE_DELAY
 	def_bool y