ARM: 9128/1: mm: Refactor the __do_page_fault()

ARM: 9128/1: mm: Refactor the __do_page_fault()

Clean up the multiple goto statements and drops local variable
vm_fault_t fault, which will make the __do_page_fault() much more
readability.

No functional change.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
[backport of mainline commit caed89dab0ca0e73d7e016c04e1f5957650f4ec3]
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Change-Id: Ice8f005ae5aa4cc54a983a377d89657511bfa632