Make TEXTURE_3D the only target requiring ASTC HDR

TEXTURE_2D, TEXTURE_CUBE_MAP, and TEXTURE_2D_ARRAY are all valid
ASTC LDR texture targets.

Bug: 20763531
Bug: 20763295
Change-Id: Ib89795b9700c0f2d5816a4cd667879940d6646fa
2 files changed