msm: vidc: NOC registers for bengal

In Bengal, avoid reading NOC registers during NOC issue.
The same is done for below reasons,
1. NOC registers, in Bengal, are not populated with the
required info.
2. During CPU NOC issue, it is not advised to access
vcodec registers as vcodec could be in power collapsed
state.

Change-Id: I27baf63ea3ddf0ea6b820799e9714a8f67169c56
Signed-off-by: Vikash Garodia <vgarodia@codeaurora.org>