frameworks/native: Reset update buffer geometry

Reset update buffer geometry when setBuffersGeometry is invoked to
reallocate the buffer for the new resolution.

Change-Id: I5da0bc8739af5e7c619ee6185b33712015112672
frameworks/native: Increase EGL blob cache size limits

Increase the size of the EGL Blob Cache to 2MB and the key size to 4K.
This helps improve the performance of OpenGL apps, especially Open GLESv1.1
apps whose shaders are generated on the fly.

CRs-fixed: 393074

Change-Id: Ic3772a9722b63351c940d40794cf54073a8b5eed