gl-renderer: query EGL to determine if GL_TEXTURE_EXTERNAL_OES should be used

Using the number of planes to determine if GL_TEXTURE_EXTERNAL_OES should be
used is incorrect with some modifiers: For example RGBA with a
I915_FORMAT_MOD_Y_TILED_CCS modifier has two planes.

Use eglQueryDmaBufModifiersEXT() to query if the current format/modifier only
supports GL_TEXTURE_EXTERNAL_OES.

Use the current code as fallback of modifiers are not supported.

Signed-off-by: Michael Olbrich <m.olbrich@pengutronix.de>