device-pine64-pinebookpro: configure getty for serial port (MR 2348)

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

device/testing/device-pine64-pinebookpro/APKBUILD

 # Reference: <https://postmarketos.org/devicepkg>
 pkgname=device-pine64-pinebookpro
 pkgdesc="PINE64 Pinebook Pro"
-pkgver=4
+pkgver=5
 pkgrel=0
 url="https://postmarketos.org"
 license="MIT"
@@ -66,7 +66,7 @@ nonfree_firmware() {
 	mkdir "$subpkgdir"
 }
 sha512sums="
-77a8d2ab9a3f5867cb28acb8b2761230152b8f0be443013968617ee8c046685198e974180bed04d24d7d25203e938906d98d94dccb1a257e3049140a010d6f78  deviceinfo
+1955c70871c148e06cad3e8a8929e598c9d1b911cef33e59e699748bc0709fcda9081d891d6c372298b4521349eff7c430c95dc4a2012a4dac1c456306bfd8a2  deviceinfo
 244a321cbc885d7cb90cdc2b905b39efdeaa9d77aa33208aa6b699059a955e5c15247e4dfcd762fd34ece98d686c7da5ffa84acb38044446079f13c193955865  extlinux.conf
 d3988fe83c54228d743f4a8c190e9530404a436a7fbc0b004bf20d3986b502d864717d8cc9c76812e599266bf84cb08f9a86e1bfd220875799c5a022aea588ec  10-pinebookpro.hwdb
 bcae155e24a151d3c098833680b83b6004a329962f115480d560ebe19257eab87286b8a4c194e456c067ca54fb53e59a5a16b022cea13c11135b0855145db563  mem_sleep.conf

device/testing/device-pine64-pinebookpro/deviceinfo

@@ -17,6 +17,7 @@ deviceinfo_keyboard="true"
 deviceinfo_external_storage="true"
 deviceinfo_screen_width="1920"
 deviceinfo_screen_height="1080"
+deviceinfo_getty="ttyS2;1500000"
 
 # Installer related
 deviceinfo_dev_internal_storage="/dev/mmcblk2"