hwcomposer: Correct padding for 32/64-bit

The size of hwc_layer_1_t varies depending on whether we're building
for a 32- or 64-bit target. This change splits the padding into two
sections so that we can add more fields without changing the overall
size on either bitness.

Change-Id: Ib7c960a9feb0061586dc6398211d7d3dc012d573
1 file changed