UPSTREAM: HID: input: map digitizer battery usage

We already mapped battery strength reports from the generic device
control page, but we did not update capacity from input reports, nor we
mapped the battery strength report from the digitizer page, so let's
implement this now.

Batteries driven by the input reports will now start in "unknown" state,
and will get updated once we receive first report containing battery
strength from the device.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Bug: 146590412
Signed-off-by: Siarhei Vishniakou <svv@google.com>
Change-Id: I15f2e1c1349e2cf044c45a6697015b95596ce760
Git-commit: 5e88a0aa262f12c609b99571811acdaf19149f65
Git-repo: https://source.codeaurora.org/quic/la/kernel/msm-4.4


Signed-off-by: Swetha Chikkaboraiah <schikk@codeaurora.org>