[MIPS] Fix R4K cache macro names

Several machines have the R4K cache macro name spelled incorrectly.  Namely,
they have cpu_has_4kcache defined instead of cpu_has_4k_cache.

Signed-off-by: Joshua Kinard <kumba@gentoo.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/include/asm-mips/mach-ip22/cpu-feature-overrides.h b/include/asm-mips/mach-ip22/cpu-feature-overrides.h
index 2a37bed..f7c5dc8 100644
--- a/include/asm-mips/mach-ip22/cpu-feature-overrides.h
+++ b/include/asm-mips/mach-ip22/cpu-feature-overrides.h
@@ -13,7 +13,7 @@
  */
 #define cpu_has_tlb		1
 #define cpu_has_4kex		1
-#define cpu_has_4kcache		1
+#define cpu_has_4k_cache	1
 #define cpu_has_fpu		1
 #define cpu_has_32fpr		1
 #define cpu_has_counter		1