Hardcode EGL Cache size to something more reasonable

Most of our devices are setting much larger values here than the
default, so instead of hoping every device sets the larger values, just
hardcode the cache size to the larger values.

This also reduces build-time configuration, so we can share the built
library between more devices.

Test: /data/nativetest*/EGL_test/EGL_test on aosp_flounder-eng
Change-Id: Id9b80cecff837cc35043ad3c3cf1d1c60595c237