device-lenovo-21bx: drop pd-mapper (MR 5399)

This is now built into the kernel, so we no longer need the userspace pd-mapper.

See https://gitlab.com/postmarketOS/pmaports/-/issues/2936

[ci:skip-build]: already built successfully in CI

device/community/device-lenovo-21bx/APKBUILD

@@ -5,7 +5,7 @@
 pkgname=device-lenovo-21bx
 pkgdesc="Lenovo ThinkPad X13s"
 pkgver=10
-pkgrel=0
+pkgrel=1
 url="https://postmarketos.org"
 license="MIT"
 arch="aarch64"
@@ -18,8 +18,6 @@ depends="
 	linux-firmware-qca
 	linux-firmware-qcom
 	linux-lenovo-21bx
-	pd-mapper
-	pd-mapper-openrc
 	postmarketos-base
 	qmi-utils
 	systemd-boot
@@ -36,7 +34,6 @@ subpackages="
 	$pkgname-usbguard
 	$pkgname-vulkan
 "
-install="$pkgname.post-install"
 
 build() {
 	devicepkg_build $startdir $pkgname

device/community/device-lenovo-21bx/device-lenovo-21bx.post-install

@@ -1,3 +0,0 @@
-#!/bin/sh -e
-
-rc-update add -q pd-mapper boot