clover/device: Move device_version into core and add device_clc_version

clover/device: Move device_version into core and add device_clc_version

The device version is the maximum CL version that the device supports.

device_version and device_clc_version are not necessarily the same for
devices that support CL 1.0, but have a 1.1 compiler and the necessary
extensions.

Eventually, this will be based on the features/extensions of the actual
device, but for now move it a bit closer to its eventual destination.

Signed-off-by: Aaron Watry <awatry@gmail.com>
Reviewed-by: Jan Vesey <jan.vesely@rutgers.edu>