power: supply: qcom_battmgr: Notify charger supplies of online changes

On SC8280XP and X1E80100 the AC, USB and wireless supplies take their
online state from the charging source in the battery status response.
The firmware sends no notification for those supplies when the charging
source changes, and the driver only announces the battery, so userspace
never learns that the charger was plugged in or out. UPower keeps the
state it read at startup: a laptop booted on the charger never goes on
battery.

Call power_supply_changed() for a supply whose online state changes when
a status response is parsed. A supply that is not registered yet, when
the battery is read during probe, reports its state when it registers.

Tested on a Microsoft Surface Pro 11 (X1E80100): after restarting UPower
on the charger, unplugging now sets OnBattery, and plugging in clears it.

Fixes: 29e8142b5623 ("power: supply: Introduce Qualcomm PMIC GLINK power supply")
Cc: stable@vger.kernel.org
Assisted-by: Claude:claude-opus-5-5
Signed-off-by: Brandon Williams <turbine.bmw@gmail.com>
Link: https://patch.msgid.link/20261013-upstream-battmgr-charger-online-v1-1-731973e133a0@gmail.com
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

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