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HACK: Set “Mains” type for charge_pump_master's “Nothing attached“

Jami Kettunen requested to merge deathmist/kernel-fairphone-sm7225:fix-zero-battery into halium-11.0

Attempting to treat SMB1398_V2 (charge_pump_master) as a battery in UPower is useless because it reports horrendously wrong details about both the battery charging status and battery percentage, making Ubuntu Touch think the battery is empty while plugged in and having already reached 100% charging state.

Note that this still makes the battery show up as not charging at 100% (which I think is fair enough) due to the still reported online: no status from the charge_pump_master device.

Fixes https://gitlab.com/ubports/porting/community-ports/android11/fairphone-4/fairphone-fp4/-/issues/13.

Before:

Device: /org/freedesktop/UPower/devices/battery_charge_pump_master
  native-path:          charge_pump_master
  model:                SMB1398_V2
  power supply:         yes
  updated:              Tue 10 Jan 2023 01:50:07 AM EET (85 seconds ago)
  has history:          yes
  has statistics:       yes
  battery
    present:             yes
    rechargeable:        yes
    state:               empty
    warning-level:       none
    energy:              0 Wh
    energy-empty:        0 Wh
    energy-full:         0 Wh
    energy-full-design:  0 Wh
    energy-rate:         0 W
    percentage:          0%
    capacity:            100%
    icon-name:          'battery-empty-symbolic'

After:

Device: /org/freedesktop/UPower/devices/line_power_charge_pump_master
  native-path:          charge_pump_master
  power supply:         yes
  updated:              Tue 10 Jan 2023 02:14:29 AM EET (290 seconds ago)
  has history:          no
  has statistics:       no
  line-power
    warning-level:       none
    online:              no
    icon-name:          'ac-adapter-symbolic'

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