qbt1000: Initialize drvdata structure before usage

Fix uninitialized local variable error which might have lead to
crash

Bug: 35764241
Change-Id: I3fd95cb343c3175e4190c8ebfe209399db0602a6
CRs-Fixed: 2030137
Signed-off-by: Abir Ghosh <abirg@codeaurora.org>