[MIPS] Make mips_srs_init static.

Nothing outside traps.c uses it.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index e9902d8..4901f0a 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -1052,7 +1052,7 @@
 	unsigned long sr_allocated;
 } shadow_registers;
 
-void mips_srs_init(void)
+static void mips_srs_init(void)
 {
 #ifdef CONFIG_CPU_MIPSR2_SRS
 	shadow_registers.sr_supported = ((read_c0_srsctl() >> 26) & 0x0f) + 1;