Work around CTS failure in eglCreateImageKHR.

Qualcomm driver does not accept EGL_GL_COLORSPACE_DEFAULT_EXT. However,
the meaning of this attribute is the same as not passing any colorspace
attribute at all, so we can simply strip it.

Bug: 78640230
Bug: 78660105
Test: Ran CtsVrTestCases on Pixel XL, passes.
Change-Id: I265fbb70366f81b5ab75d06343ea85e0524dd314