OMAP4: TILER: Add variable alignment allocation API

Added tiler_alloc_block_area_aligned API to allow
for variable alignment when allocating when using the kernel
APIs.

Change-Id: I2f3c44675a3fa1b2c6dfef21ccdd9bcac2f1d0e5
Signed-off-by: Andy Gross <andy.gross@ti.com>
Signed-off-by: Tony Zlatinski <x0146664@ti.com>
Signed-off-by: Atanas (Tony) Zlatinski <zlatinski@gmail.com>