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In the previous CL https://crrev.com/c/1624385 I forwarded wrong axis
indices to ARC. In order to forward correct evdev ABS_CNT axis indices,
you have to also keep raw indices in ui::GamepadDevice::Axis.

This is a part of the effort to improve ARC gamepad compatibility.
Design doc: go/arc-improved-gamepad

TEST=manual(--enable-features=ExoRawGamepadInfo to /etc/chrome_dev.conf)
BUG=b:130597086

Change-Id: I997b262749b413cee38af40cc498ea2b399e2904
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1631150Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Mitsuru Oshima (OOO 5/28) <oshima@chromium.org>
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664082}