Staging:lustre:lclient:Remove unused function

Discard the function ccc_vmpage_page_transient as it is not used
anywhere in the kernel.
Used grep to find occurences.
Problem found using sparse.

Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>