RefClock: Enable on Intel and AMD

As requested for testing.

Btw. the string find is in O(n), which is the same as for the std::transform + the compare.
Intel:
NOTICE: GL_VENDOR = Intel Open Source Technology Center
NOTICE: GL_RENDERER = Mesa DRI Intel(R) Haswell Mobile

AMD:
NOTICE: GL_VENDOR = X.Org
NOTICE: GL_RENDERER = Gallium 0.4 on AMD PALM

The PALM bit will be exchanged with the current chip generation, e.g. SUMO and so on. And most likely the number will also change over time.