MIPS: Move Qemu MIPS target to boards.cfg

CONFIG_QEMU_MIPS is already provided by <configs/qemu-mips.h>, so we
don't generate it using the options fields in boards.cfg.
Signed-off-by: NShinya Kuribayashi <skuribay@pobox.com>

Makefile

@@ -1136,11 +1136,6 @@ vct_platinumavc_onenand_small_config: unconfig
 		echo "#define CONFIG_VCT_SMALL_IMAGE" >> $(obj)include/config.h
 	@$(MKCONFIG)  -n $@ -a vct mips mips vct micronas
 
-qemu_mips_config	: unconfig
-	@mkdir -p $(obj)include
-	@echo "#define CONFIG_QEMU_MIPS 1" >$(obj)include/config.h
-	@$(MKCONFIG) -a qemu-mips mips mips qemu-mips
-
 #========================================================================
 # Nios
 #========================================================================

boards.cfg

@@ -221,6 +221,7 @@ dbau1550_el                  mips        mips        dbau1x00            -
 gth2                         mips        mips
 pb1000                       mips        mips        pb1x00              -              -           pb1x00:PB1000
 purple                       mips        mips
+qemu_mips                    mips        mips        qemu-mips           -              -           qemu-mips
 tb0229                       mips        mips
 PCI5441                      nios2       nios2       pci5441             psyent
 PK1C20                       nios2       nios2       pk1c20              psyent