usb: host: Fix array access to a non verified index

Fix code quality issues found by the automatic checking tool,
that can cause out of bound access to the port_status and hostpc arrays.
Verify wIndex before accessing the arrays in this index.

Change-Id: Iec7b7b6b66a318e4e97b23ce243e7a128dbf795a
CRs-Fixed: 566927
Signed-off-by: Danny Segal <dsegal@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>