LU-3974 llite: invalidatepage api changed

LU-3974 llite: invalidatepage api changed

Until recently invalidating pages from the buffer cache
was dependent only on the page passed in and the start
in the page to invalidate. Starting with the 3.11 kernel
you can also specify the length of the data in the page
to invalidate. This patch enables us to handle the new
case.

Signed-off-by: James Simmons <uja.ornl@gmail.com>
Change-Id: Iedf458b20b2604bc3099d5ae38bf0ad07df83bd3
Reviewed-on: http://review.whamcloud.com/7729
Tested-by: Jenkins
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Peng Tao <bergwolf@gmail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>