MIPS: VR41xx: Use __flush_cache_all instead of flush_cache_all.

It's probably a good idea to flush caches before reset and by the time
this code was written flush_cache_all did actually still do something.
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/vr41xx/common/pmu.c

@@ -73,7 +73,7 @@ static inline void software_reset(void)
 	default:
 		set_c0_status(ST0_BEV | ST0_ERL);
 		change_c0_config(CONF_CM_CMASK, CONF_CM_UNCACHED);
-		flush_cache_all();
+		__flush_cache_all();
 		write_c0_wired(0);
 		__asm__("jr	%0"::"r"(0xbfc00000));
 		break;