usb_hid_keyboard: fix incorrect sleep/lock key position
usb_hid_keyboard: fix incorrect sleep/lock key position

The position of SLEEP_KEY_MASK bit is not in its intended
position because TK_* enum is 1-indexed. Fix this bug by
shift the mask by 1.

BUG=b:196934919
TEST=evtest
BRANCH=trogdor

Signed-off-by: Ting Shen <c671d3efec3d7e7e285f3788bf0d1ba4c8605b78@google.com>
Change-Id: I900636f032786510f7870948d1856d0bc4374800
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3097478
Reviewed-by: Rong Chang <3a05493f7adfb36d203f663b3bc2ba30e9d6284f@chromium.org>
Commit-Queue: Ting Shen <c671d3efec3d7e7e285f3788bf0d1ba4c8605b78@chromium.org>
Tested-by: Ting Shen <c671d3efec3d7e7e285f3788bf0d1ba4c8605b78@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec