msm: camera: util: Add support for generic blob command buffer

Add util function to parse the given generic blob command buffer
and call the callback function for each blob type that exists
in the command buffer.

Change-Id: I0ed03db3c9df5a20867ba89ec749142eb90ba0e5
Signed-off-by: Pavan Kumar Chilamkurthi <pchilamk@codeaurora.org>