msm: cvp: Fix a CVP SSR deadlock

When CVP SSR is triggred by debug node, CVP is still working,
such as sending HFI MSG back to kernel driver. While kernel
driver handles HFI MSG, there is dealock in acquiring CVP
core mutex and device mutex. They are also acquired by SSR handler.

Change-Id: I28060312f8f239dfa3ac36c5bb8c7a5b720abdc2
Signed-off-by: George Shen <sqiao@codeaurora.org>