msm: mink: handle interrupt while waiting for cb response

Currently, CB request thread blocks interrupt while waiting for a
response to come. This causes problem when client is killed focibly.
Allowing interrupts to come and handle interruption gracefully.

Change-Id: Id1a9a594b7c8ab1b10d5c9a895889ce3666bd862
Signed-off-by: Dinesh K Garg <dineshg@codeaurora.org>