[Mesa-dev] clover: Add support for quering CL_DEVICE_MAX_CLOCK_FREQUENCY

[Bruno Jiménez]

This series is based in Tom Stellard's 'clover-clock' branch:
http://cgit.freedesktop.org/~tstellar/mesa/log/?h=clover-clock
And should fix this bug report:
https://bugs.freedesktop.org/show_bug.cgi?id=73511

The only changes from the original branch are in patches 2 and 3.
Patch 2 has been updated so that it applies to current master.
Patch 3 has been updated so that it returns the frequency in MHz,
not in kHz.