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

This reverts commit fa355f60
Issue was seen since wIndex is allowed to be 0 in some cases-and
the registers that are referenced with the invalid index won't be
touched in those cases.

Change-Id: If0a6840cfe4785d0d6dd7df39671201927af3bc4
Signed-off-by: Lena Salman <esalman@codeaurora.org>