toolchain: remove nommu option for MIPS

MIPS nommu never took off, the only MIPS processors without MMU are
microcontrollers and the only uclinux effort for them has non-upstream
patches against very very old versions.
See http://www.xiptech.com/uclinuxformips.htm

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

toolchain/toolchain-common.in

@@ -92,7 +92,7 @@ config BR2_NEEDS_GETTEXT_IF_LOCALE
 	default y if (BR2_NEEDS_GETTEXT && BR2_ENABLE_LOCALE)
 
 config BR2_USE_MMU
-	bool "Enable MMU support" if BR2_arm || BR2_armeb || BR2_mips || BR2_mipsel || BR2_sh || BR2_xtensa
+	bool "Enable MMU support" if BR2_arm || BR2_armeb || BR2_sh || BR2_xtensa
 	default y if !BR2_bfin
 	help
 	  If your target has a MMU, you should say Y here.  If you