Don't try to load ANGLE without a namespace

Now that we've moved to only loading ANGLE from a namespace,
don't try to load it if the namespace isn't present, which
happens for many early apps during startup.

Bug: 80239516
Test: Manual, check log for spurious loads, ANGLE still works
Test: cts-tradefed run singleCommand cts -m CtsAngleIntegrationHostTestCases
Change-Id: I03ae3475070c4a1c0cab5fdaa8605ef274065721
(cherry picked from commit 56ccdeb7fb2b3a19f8c87031e306441ccd54f5dc)