sh: asm/tlb.h needs linux/pagemap.h for CONFIG_SWAP=n.

linux/swap.h really wants to include linux/pagemap.h in order to satisfy
the page_cache_release()/release_pages() definition requirements when
CONFIG_SWAP=n. Unfortunately the code in question contains:

	/* only sparc can not include linux/pagemap.h in this file
	 * so leave page_cache_release and release_pages undeclared... */
	#define free_page_and_swap_cache(page) \
		page_cache_release(page)
	#define free_pages_and_swap_cache(pages, nr) \
		release_pages((pages), (nr), 0);

so it looks like we're stuck with doing it in asm/tlb.h instead, as
others already do (ARM, CRIS, etc.). Grumble.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

include/asm-sh/tlb.h

@@ -20,6 +20,7 @@
  */
 #define tlb_flush(tlb)				flush_tlb_mm((tlb)->mm)
 
+#include <linux/pagemap.h>
 #include <asm-generic/tlb.h>
 
 #endif /* __ASSEMBLY__ */