Revert "Fix RGBA4 and RGB5A1 format & internalFormat"
Revert "Fix RGBA4 and RGB5A1 format & internalFormat"

This reverts commit 5b9b75abb237604e522976f0dd52eb3e8bc60d5c.

jdryg/bgfx,emoon/bgfx,jpcy/bgfx,LWJGL-CI/bgfx,mendsley/bgfx,bkaradzic/bgfx,emoon/bgfx,bkaradzic/bgfx,bkaradzic/bgfx,jdryg/bgfx,LWJGL-CI/bgfx,jpcy/bgfx,mendsley/bgfx,mendsley/bgfx,LWJGL-CI/bgfx,LWJGL-CI/bgfx,emoon/bgfx,jpcy/bgfx,jpcy/bgfx,jdryg/bgfx,jdryg/bgfx,bkaradzic/bgfx