HACK remove all mips defconfigs

arch/mips/configs/ar7_defconfig

arch/mips/configs/ath25_defconfig

arch/mips/configs/ath79_defconfig

arch/mips/configs/bcm47xx_defconfig

arch/mips/configs/bcm63xx_defconfig

arch/mips/configs/bigsur_defconfig

arch/mips/configs/bmips_be_defconfig

arch/mips/configs/bmips_stb_defconfig

arch/mips/configs/capcella_defconfig

arch/mips/configs/cavium_octeon_defconfig

arch/mips/configs/ci20_defconfig

arch/mips/configs/cobalt_defconfig

arch/mips/configs/db1xxx_defconfig

arch/mips/configs/decstation_defconfig

arch/mips/configs/e55_defconfig

arch/mips/configs/fuloong2e_defconfig

arch/mips/configs/gcw0_defconfig

arch/mips/configs/generic/32r1.config

arch/mips/configs/generic/32r2.config

arch/mips/configs/generic/32r6.config