msm: camera: tfe: Add packet code get command for tfe

Add packet opcode get command in the tfe hw manager.
This is required during the packet config in the isp context to
check the packet type init or config.

CRs-Fixed: 2599088
Change-Id: Id1ecf60bccc00aedf317d9cd223c4daea83fe84e
Signed-off-by: Ravikishore Pampana <rpampana@codeaurora.org>