Remove temporary EGL mitigations for Android P.

Attributes passed to eglCreateImageKHR are no longer filtered,
and the invalid extension name EGL_KHR_image_gl_colorspace is no longer
corrected to EGL_EXT_image_gl_colorspace.

Test: Pixel XL boots.
Change-Id: I449a569972b7677d63a459a92cf86ed32e1baf4a