ANDROID: sdcardfs: fault and page_mkwrite take only vmf

Upstream commit 11bac800 ("mm, fs: reduce fault, page_mkwrite,
and pfn_mkwrite to take only vmf"), refactored fault() and
page_mkwrite() to take only vmf as parameter.
Fix sdcardfs_fault() and sdcardfs_page_mkwrite() accordingly.

Signed-off-by: Amit Pundir <amit.pundir@linaro.org>