Include space for chroma in the padding allocated in ih264e_get_total_pic_buf_size

Chroma is already accounted for in e.g. num_samples by multiplying
the number of luma samples by 3/2, so include it in the padding
calculation as well.

This fixes encoding 176x144 at level 1.0 - normally this isn't an issue
since the padding is a bit overestimated, but for this particular
resolution/level combination, it fails unless this is calculated properly.

Change-Id: Id5df6e5aee4d3d78f4c28a3b7d5fed6fe42a1f2c
1 file changed