Revert "dma-coherent: limit alignment of dma-coherent allocations"

This reverts commit 88ae006e ("dma-coherent: limit alignment of
dma-coherent allocations")

This change did not properly limit alignment.
Revert for now and decide if an alternative solution should be applied.

Change-Id: If3acf8bd3d7fd4ec77c499e4e659c0a678a52735
Signed-off-by: Liam Mark <lmark@codeaurora.org>