mm: Fix incorrect cache attribute restoration.

armv7 uses cache policy as WRITEALLOC. CPA is
restoring the cache attributes to WRITEBACK during
set_pages_array_wb().
Fixed issues in pmd to pte prot translation and vice versa.

Change-Id: I8406b784f62d559f657ef7bc08e77c83ac6e5690
Signed-off-by: Krishna Reddy <vdumpa@nvidia.com>
Reviewed-on: http://git-master/r/122472
Reviewed-by: Simone Willett <swillett@nvidia.com>
Tested-by: Simone Willett <swillett@nvidia.com>
timekeeping: fix 32-bit overflow in get_monotonic_boottime

get_monotonic_boottime adds three nanonsecond values stored
in longs, followed by an s64.  If the long values are all
close to 1e9 the first three additions can overflow and
become negative when added to the s64.  Cast the first
value to s64 so that all additions are 64 bit.

Change-Id: Ic996d8b6fbef0b72f2d027b0d8ef5259b5c1a540
Signed-off-by: Colin Cross <ccross@android.com>