sh64: asm/pgtable.h needs asm/mmu.h

Needed to satisfy the __in_29bit_mode() check.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/include/asm/pgtable.h

@@ -18,6 +18,7 @@
 #include <asm/pgtable-2level.h>
 #endif
 #include <asm/page.h>
+#include <asm/mmu.h>
 
 #ifndef __ASSEMBLY__
 #include <asm/addrspace.h>