m32r: remove the unused NOHIGHMEM option

Remove the unused NOHIGHMEM option.
Reviewed-by: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>

arch/m32r/Kconfig

@@ -216,10 +216,6 @@ config MEMORY_SIZE
 	default "01000000" if PLAT_M32104UT
 	default "00800000" if PLAT_OAKS32R
 
-config NOHIGHMEM
-	bool
-	default y
-
 config ARCH_DISCONTIGMEM_ENABLE
 	bool "Internal RAM Support"
 	depends on CHIP_M32700 || CHIP_M32102 || CHIP_VDEC2 || CHIP_OPSP || CHIP_M32104