ANDROID: GKI: Pad vendor properties to power_supply_property enum

Reserve 2 vendor properties to `enum power_supply_property` in
preparation to accept backports related to power supply properties
without breaking KMI.

These are the following properties added:
  * Vendor Identifier (VID): Assigned to the battery manufacturer by USB
    Implementers Forum (USB-IF).
  * Product Identifier (PID) assigned by the manufacturer to the
    battery.

Link to the expected backports in later releases:
https://lore.kernel.org/all/20250507-batt_ops-v2-0-8d06130bffe6@google.com/

Bug: 417547450
Bug: 317920498
Change-Id: I22980870083bdeab22d5e04e3d8efe975d7ff38e
Signed-off-by: Amit Sunil Dhamne <amitsd@google.com>

include/linux/power_supply.h

@@ -181,6 +181,12 @@ enum power_supply_property {
 	POWER_SUPPLY_PROP_MODEL_NAME,
 	POWER_SUPPLY_PROP_MANUFACTURER,
 	POWER_SUPPLY_PROP_SERIAL_NUMBER,
+	/*
+	 * Properties of type `int'. Appended at the end of list to minimize ABI
+	 * breakage.
+	 */
+	POWER_SUPPLY_PROP_USBIF_VENDOR_ID,
+	POWER_SUPPLY_PROP_USBIF_PRODUCT_ID,
 };
 
 enum power_supply_type {