msm: Change SPARSEMEM section_size to 256MB

Reduce SPARSEMEM section_size to 256MB.  This is needed
to support memory offlining.
Reserving 512MB as movable zone drastically reduces the
virtual memory available for vmalloc allocations.

Change-Id: I5e96357ef3907ad94ba32660f281cc78b0072003
Signed-off-by: Jack Cheung <jackc@codeaurora.org>
2 files changed