Increase EGL cache size limits

This helps improve the performance of OpenGL apps, especially Open GLESv1.1
apps whose shaders are generated on the fly.
egl.cfg was deprecated and unnecessary
Revert "Provide libskia_legacy for compatibility with browser saved pages from Android 4.2 and earlier"

This reverts commit cd02cc61e8bcf065a90f1bdb512e23773bfdbcc7.