device-motorola-rtwo: set vbmeta fastboot partition

So 'pmbootstrap flasher flash_vbmeta' generates + flashes a
verification-disabled vbmeta. Motorola bootloaders can still enforce AVB
on boot/dtbo/init_boot/vendor_boot even when unlocked, rebooting when the
flashed images don't match the stock vbmeta hashes.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QF5HebjUsRaxbW4cBX6HJP

device/testing/device-motorola-rtwo/APKBUILD

@@ -2,7 +2,7 @@
 maintainer="snlavaise <snlavaise@gmail.com>"
 pkgname=device-motorola-rtwo
 pkgver=1
-pkgrel=7
+pkgrel=8
 pkgdesc="Motorola Moto Edge 40 Pro"
 url="https://postmarketos.org"
 arch="aarch64"
@@ -36,6 +36,6 @@ package() {
 }
 
 sha512sums="
-e66050dc46b1933b4e3bf7d4918e72ed68218015cc714615b26801030c3f9b481815eba0a01c9795a479353511cb7928d1f1cb0b3dc1b3817ca4c7cd5f1f8301  deviceinfo
+2346e41081fa6fa5762e86f75630a7851e52a180f39989468bfdb76c4c0c0ddeaf72cb62996d35a8784083428abc5fa34be8d04874c57bd573b20aca4cf5c447  deviceinfo
 c572e21cb0624b554a22a218b0c4faab9b6412654bed6bfef530f3068d076b21c573bd7f4b3ca65f510f8756f636a861191cce925ef49587db7d68d09558826c  modules-initfs
 "

device/testing/device-motorola-rtwo/deviceinfo

@@ -31,6 +31,7 @@ deviceinfo_create_initfs_extra="true"
 # Bootloader related
 deviceinfo_flash_method="fastboot"
 deviceinfo_flash_fastboot_partition_dtbo="dtbo"
+deviceinfo_flash_fastboot_partition_vbmeta="vbmeta"
 deviceinfo_kernel_cmdline="console=tty0 console=ttyMSM0,115200n8 earlycon clk_ignore_unused pd_ignore_unused ignore_loglevel"
 deviceinfo_generate_bootimg="true"
 # The Motorola bootloader places the DTB / kernel at the addresses in the