[MIPS] Fix optimization for size build.
    
It took a while longer than on other architectures but gcc has finally
started to strike us as well ...
    
This also fixes the damage by 6edfba1b33c701108717f4e036320fc39abe1912.
    
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index 133900a..aa37ae6 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -83,6 +83,8 @@
 LDFLAGS_vmlinux			+= -G 0 -static -n -nostdlib
 MODFLAGS			+= -mlong-calls
 
+cflags-y += -ffreestanding
+
 #
 # We explicitly add the endianness specifier if needed, this allows
 # to compile kernels with a toolchain for the other endianness. We