EGL: querying client extensions as well for EGL 1.5 extensions

According to the EGL specification, EGL_EXT_client_extensions is
expected in the set of supported client extensions that is queried
without initializing a display.

Bug: 129370892
Test: On EGL 1.4 device
Test: CtsDeqpTestCases:include-filter:dEQP-EGL.*
If device has all the necessary extensions, EGL version will be 1.5

Change-Id: I7138dd2228bd79940c7d2dc4f3c89491e94d8d02