sh: Get SH-5 caches working again post-unification.

A number of cleanups to get the SH-5 cache management code in line with
the rest of the SH backend.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/include/asm-sh/mmu_context_64.h b/include/asm-sh/mmu_context_64.h
index 020be74..9649f1c 100644
--- a/include/asm-sh/mmu_context_64.h
+++ b/include/asm-sh/mmu_context_64.h
@@ -66,6 +66,9 @@
 		      : "=r" (sr), "=r" (pc) : "0" (sr));
 }
 
+/* arch/sh/kernel/cpu/sh5/entry.S */
+extern unsigned long switch_and_save_asid(unsigned long new_asid);
+
 /* No spare register to twiddle, so use a software cache */
 extern pgd_t *mmu_pdtp_cache;