msm: camera: isp: Fix RDI stream streamoff issue

When stop the RDI stream, the wait flag should not be set to true if we
are halting the system. In the new logic, the halt will cause the system
timeout due to ispif might be stopped.
The change will stop the RDI without waiting if the VFE will be halted.

CRs-fixed: 991080
Change-Id: Ia0a7512006c1eeb15deb10b87aaff5668a7b5ef2
Signed-off-by: Jing Zhou <jzhou70@codeaurora.org>