st/mesa: Fix EGLImageTargetTexture2D for GL_TEXTURE_2D

st/mesa: Fix EGLImageTargetTexture2D for GL_TEXTURE_2D

Before this change, internalFormat was defaulted to GL_RGBA (
unsized internal format). Therefore, subsequent glTexSubImage2D
call with type != GL_UNSIGNED_BYTE, GL_UNSIGNED_SHORT_4_4_4_4 or
GL_UNSIGNED_SHORT_5_5_5_1 would give GL_INVALID_OPERATION.

This fixes

android.graphics.cts.BitmapColorSpaceTest#test16bitHardware
android.graphics.cts.ImageDecoderTest#testDecodeBitmap*
android.graphics.cts.BitmapTest#testNdkFormatsHardware

in CtsGraphicsTestCases

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6382>