Hexagon: Add page-fault support.

Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
Signed-off-by: Linas Vepstas <linas@codeaurora.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --cc arch/hexagon/include/asm/mem-layout.h
Simple merge

diff --cc arch/hexagon/include/asm/vm_fault.h
Simple merge

diff --cc arch/hexagon/mm/init.c
Simple merge

diff --cc arch/hexagon/mm/vm_fault.c
Simple merge