USB: HSIC SMSC HUB: Fix compilation warning for uninitialized variable

Fix below compilation warning:
smsc_hub.c:392: warning: 'hsic_host_auxdata' may be used
uninitialized in this function error, forbidden warning: smsc_hub.c:392

Change-Id: Ib3a4e1feaef40d065b9cd641f8bd7244cb15eb0b
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>