Add a few utils for tcu::TextureFormat

 * tcu::isValid(TextureFormat) can be used to check if format is
supported by tcuTexture.

 * tcu::isAccessValid() can be used to check if getPixel/setPixel access
type is supported for TextureFormat.

 * Added tcu::getPixelSize() and deprecated
TextureFormat::getPixelSize().

Change-Id: Ibed3c130d238fb61bb8572678bd6c94ba9457cf9
4 files changed