device-samsung-lt01: add nonfree-firmware to _pmb_recommends (MR 4963)

Since the prompt has been dropped in pmbootstrap, install the firmware here.

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

device/testing/device-samsung-lt01/APKBUILD

@@ -3,7 +3,7 @@
 pkgname=device-samsung-lt01
 pkgdesc="Samsung Galaxy Tab 3 8.0"
 pkgver=1
-pkgrel=0
+pkgrel=1
 url="https://postmarketos.org"
 license="MIT"
 arch="armv7"
@@ -14,6 +14,7 @@ depends="
 	postmarketos-base
 	postmarketos-update-kernel
 	"
+_pmb_recommends="$pkgname-nonfree-firmware"
 makedepends="devicepkg-dev"
 subpackages="
 	$pkgname-nonfree-firmware:nonfree_firmware