build: remove obsolete mips32r2 CPU_TYPE

Signed-off-by: Felix Fietkau <[email protected]>

include/target.mk

@@ -164,7 +164,6 @@ ifeq ($(DUMP),1)
     endif
     CPU_CFLAGS += -mno-branch-likely
     CPU_CFLAGS_mips32 = -mips32 -mtune=mips32
-    CPU_CFLAGS_mips32r2 = -mips32r2 -mtune=mips32r2
     CPU_CFLAGS_mips64 = -mips64 -mtune=mips64 -mabi=64
     CPU_CFLAGS_24kc = -mips32r2 -mtune=24kc
     CPU_CFLAGS_74kc = -mips32r2 -mtune=74kc