MIPS: Fix invalidate_dcache_range to operate on L1 Dcache

Commit fb64cda579 ("MIPS: Abstract cache op loops with a macro")
accidentally modified invalidate_dcache_range to operate on the L1
Icache instead of the Dcache. Fix the cache op used to operate on the
Dcache.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Fixes: fb64cda579 ("MIPS: Abstract cache op loops with a macro")

arch/mips/lib/cache.c

@@ -91,5 +91,5 @@ void invalidate_dcache_range(ulong start_addr, ulong stop)
 	if (start_addr == stop)
 		return;
 
-	cache_loop(start_addr, stop, lsize, HIT_INVALIDATE_I);
+	cache_loop(start_addr, stop, lsize, HIT_INVALIDATE_D);
 }