Initial PINE A64-LTS support

Here's my WIP branch for the PINE A64-LTS, mainline u-boot crashes before starting the kernel:

U-Boot SPL 2018.05 (Sep 08 2018 - 15:35:14 +0000)
DRAM: 0 MiB
### ERROR ### Please RESET the board ###

This branch also depends on https://gitlab.com/postmarketOS/pmbootstrap/merge_requests/1693

main/linux-postmarketos-allwinner/APKBUILD

@@ -13,7 +13,7 @@ depends=""
 makedepends="perl sed installkernel bash gmp-dev bc linux-headers elfutils-dev libressl-dev file bison flex"
 options="!strip !check !tracedeps"
 install=
-_commit="5318d34abd2ec63dab67b83b7f139b26ba8adf07"
+_commit="788a3dffccd03be306646cd3c9a1029f350df3f7"
 source="
 	linux-${_commit}.tar.gz::https://github.com/anarsoul/linux-2.6/archive/${_commit}.tar.gz
 	config-${_flavor}.aarch64
@@ -176,5 +176,5 @@ dev() {
 		fi
 	fi
 }
-sha512sums="632889f0bfe37fa81c6c31236622cd5e6c6cbeca83482a9fb44c9e41200644a2df6955a180ee0c79a0ce901891dd1f1a348196d46e562f2c59d257359a1638e8  linux-5318d34abd2ec63dab67b83b7f139b26ba8adf07.tar.gz
+sha512sums="8a5b6cbb549360c93d80a888e00a3341333f692db959c9b9b4a182f5bafa471a39ffe2f77e2c5ce9d9b0c197715b04054c7343ec3a160e9e0b52650bbdaeef07  linux-788a3dffccd03be306646cd3c9a1029f350df3f7.tar.gz
 b5a72a1b369f38b33adf1921292fc62ae15ddd13e7fabbd51fd2f31d9daa5db4b823c2f09209d527b95c2f2592a036c4c13c2e2584a851c5f405a61cdfa44fdd  config-postmarketos-allwinner.aarch64"