msm: kgsl: Uncross adreno_device and kgsl_device streams

Adreno should deal with adreno_devices and not kgsl_devices. Keep
usage more uniform across our devices.

Change-Id: Iccc06671d7a9653e16bdc71fdab4ff9145f60d55
Signed-off-by: Carter Cooper <ccooper@codeaurora.org>