linux-lenovo-21bx: upgrade to 6.12

To help with testing: mrtest add 5681. I intend to update this branch when new RCs are out so that it's easy for me/others to test, then merge when 6.12 is released.

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

@@ -28,6 +28,7 @@ makedepends="
 	openssl-dev
 	perl
 	python3
+	postmarketos-installkernel
 "
 
 # Source
@@ -52,10 +53,8 @@ build() {
 }
 
 package() {
-	install -Dm644 "$builddir/arch/$_carch/boot/vmlinuz.efi" \
-			"$pkgdir/boot/vmlinuz"
-
-	make modules_install dtbs_install \
+	mkdir -p "$pkgdir"/boot
+	make zinstall modules_install dtbs_install \
 		ARCH="$_carch" \
 		INSTALL_PATH="$pkgdir"/boot \
 		INSTALL_MOD_PATH="$pkgdir" \
@@ -69,5 +68,5 @@ package() {
 
 sha512sums="
 753a27539e93033ef0813a4503c661e8872b99c8dfe9e2744fb2c97e8cc494f7f6a165140959f0392e350ace3216dd522806e50a87f3f0969a3e8b7c46cea27b  linux-lenovo-21bx-6bc37da2231cfed860662fa9717d0cf2896e1145.tar.gz
-0e5faf0de2d15887079f90097210db9b17ee2d8d17f779e00d3ff5868c632d25b819f0f081ce2cfcfa659623f67f5f92d20aaafe1283324a2d72cd1daaf63615  config-lenovo-21bx.aarch64
+4c90bfd6ded4162ae697cec7873d5636a0356cc6c49e4a29eae84eace4ed3c7d9428a552b7fb757a81addc0eaea236aa2e8297f258d565a0c5a397b5a41cf6e4  config-lenovo-21bx.aarch64
 "