msm: mink: handle interrupt while waiting for cb response

Currently, CB request thread blocks interrupts while waiting for
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>