egl: simplify _eglDebugReport* API

egl: simplify _eglDebugReport* API

Instead of having three, almost identical but not quite,
_eglDebugReport* functions, simply fold them into one.

While doing so drop the unnecessary arguments 'command' and
'objectLabel'. Former is identical to funcName, while the latter is
already stored (yet unused) in _EGLThreadInfo::CurrentObjectLabel.

Cc: Kyle Brenneman <kbrenneman@nvidia.com>
Cc: Adam Jackson <ajax@redhat.com>
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com> (IRC)