opengl translator: moved some types out of eglplatform.h

Some native types like NativeFBConfig and NativeContext are
internal to the translator implementation and should not
exist in the interface headers.
Moved those types from eglplatform.h into eglinternalplatfom.h

Change-Id: I6462a007de8c185deecbb9beebc343ca3626fd0c
4 files changed