OMAP: DSSCOMP: Use vmalloc for large allocations

Use vmalloc for large allocations that do not need to be
contiguous.  This keeps more memory for kmalloc.

Change-Id: I76290a16498f8846e58559b867013b62bfa3662e
Signed-off-by: Lajos Molnar <lajos@ti.com>
use neon