MIPS: BCM63XX: drop SYS_HAS_CPU_MIPS32R1

All MIPS cores on BCM63XX identify as Broadcom, not MIPS, so no need
to support non-broadcom MIPS CPUs. This also ensures that CPU_BMIPS
is always selected.
Signed-off-by: Jonas Gorski <jogo@openwrt.org>
Signed-off-by: John Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/6246/

arch/mips/Kconfig

@@ -132,7 +132,6 @@ config BCM63XX
 	select CSRC_R4K
 	select DMA_NONCOHERENT
 	select IRQ_CPU
-	select SYS_HAS_CPU_MIPS32_R1
 	select SYS_SUPPORTS_32BIT_KERNEL
 	select SYS_SUPPORTS_BIG_ENDIAN
 	select SYS_HAS_EARLY_PRINTK