[Device support] Xiaomi galahad

Thanks for helping add support for your device. The details below were collected on-device.

### Device

```
Amply device-support request
report_schema=10
app_version=0.5.0-beta0 (500000)
distribution=foss/beta
manufacturer=Xiaomi
brand=Redmi
model=galahad
device=lancelot
product=galahad_global
fingerprint=Redmi/galahad_global/galahad:12/SP1A.210812.016/V13.0.4.0.SJCMIXM:user/release-keys
android_sdk=36
android_release=16
is_phone=true
has_charging_optimization=false
one_ui_version=none
hyperos_version=none
oplus_rom_version=none
is_lineageos=true
lineageos_version=none
is_grapheneos=false
lineage_cc_provider=unknown
lineage_cc_mode=unknown
lineage_cc_limit_mechanism=UNKNOWN
probe_protect_battery=absent
probe_battery_charge_limit=absent
probe_regular_charge_protection=absent
probe_smart_charge_protection=absent
has_lineage_settings_provider=true
adapter=lineageos-chargingcontrol-v1
adapter_matched=true
adapter_control_enabled=false
contribution_wanted=true
battery_charging_status=0
battery_plugged=false
```

### What is the manufacturer's battery-protection feature called on this device? (optional)

No source file, test, or entry point is named. Start by locating how Amply represents device-support reports and existing Xiaomi or LineageOS support, then determine the required change for Redmi galahad/lancelot; done means the device is recognized and the relevant support behavior is verified.

Written by the indexing model from the issue text.