msm: npu: Add support to get firmware capabilities

Add new property ID MSM_NPU_PROP_ID_FW_GETCAPS to retrieve firmware
capabilities. In order to allow get/set firmware properties when no
network is loaded, firmware will be enabled before sending command
to firmware and disabled afterwards.

Change-Id: I40d12c96dba6dd18e5eee147f2729b707aa1ef13
Signed-off-by: Da Hoon Pyun <dpyun@codeaurora.org>