msm: kgsl: Restrict GPU memory object alignment to 32MB

The code was being very generous in giving the user the ability to
align GPU objects on 4GB boundaries. Cut the restriction down to
32MB which is still pretty generous but within the realm of
possiblity (especially for a 32 bit GPU).  While we are at it fix
a bug in the page_alloc code that was accidently resetting the
alignment to the alloc page size.  The alignment cannot be _less_
than the max page_alloc size but there certainly isn't any reason
why you couldn't specify a larger alignment if you so wished.

Change-Id: Ic0dedbadebd4c6fd98e3bf2f3d6d5bb924223157
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>