[Cherry-pick] Clean up EGL Loader.

Removes deprecated driver loading path, clean up comments and misc.

Bug: b/293503000
Test: boot
Change-Id: Ibc62bf59ed7b0cb3671583d2af853c457977d1d1
Merged-In: Ibc62bf59ed7b0cb3671583d2af853c457977d1d1
1 file changed