device-lenovo-21bx: add dependencies for enabling wwan / mobile data (MR 4718)

In order to make it work properly, the fcc unlock script from MM should
also be enabled... This info will be added to the device's wiki page for
now since upstream MM discourages distros from enabling these unlock
scripts by default...

fixes https://gitlab.com/postmarketOS/pmaports/-/issues/2489

[ci:skip-build]: Already built successfully in CI.

device/testing/device-lenovo-21bx/APKBUILD

@@ -3,7 +3,7 @@
 # Reference: <https://postmarketos.org/devicepkg>
 pkgname=device-lenovo-21bx
 pkgdesc="Lenovo ThinkPad X13s"
-pkgver=3
+pkgver=4
 pkgrel=0
 url="https://postmarketos.org"
 license="MIT"
@@ -38,11 +38,13 @@ nonfree_firmware() {
 	depends="
 		bootmac
 		firmware-lenovo-21bx
+		libmbim-tools
 		linux-firmware-ath11k
 		linux-firmware-qca
 		linux-firmware-qcom
 		pd-mapper
 		pd-mapper-openrc
+		qmi-utils
 		"
 	install="$subpkgname.post-install"