msm: camera: isp: fix stop axi stream for offline

Stop axi stream routine does not handle properly streams which do not
use CAMIF and continuous RDI streams. In case of stream which does not
use CAMIF, it bypassed axi halt and isp reset sequence. In case of
continuous RDI stream it does not wait for completion. Also
conditional logic is simplified.

Change-Id: Ie3f65f69e731b64833f5a182ab639408b3be1473
Signed-off-by: Petar Sivenov <psiven@codeaurora.org>