Initial support for RK3399 Firefly and FriendlyARM PC T4

Based on work of David Huang https://github.com/hjc4869 Changed in the transition:
- firefly family was renamed to rk3399, which we actually never started to use. It was made for Odroid N1, which will never be sold
- adjusted compiler toolchain2 parameter
- added standard wireless drivers
- kernel config with the following changes: Docker dependencies, ZRAM, CPUfreq info, ...
- added upstream patches
- made test Ubuntu Bionic desktop and CLI Stretch build, bootlog: http://ix.io/1jVu

TBD: wifi and BT support, mainline kernel, ...

config/boards/dragonboard820c.wip

@@ -0,0 +1,21 @@
+# Dragonboard820c quad core 3GB SoC UFS GBE USB3 WiFi
+BOARD_NAME="Dragonboard 820c"
+BOARDFAMILY="qcomlt"
+BOOTCONFIG="dragonboard820c_defconfig"
+#
+MODULES=""
+MODULES_NEXT=""
+#
+KERNEL_TARGET="default,dev"
+CLI_TARGET=""
+DESKTOP_TARGET=""
+
+CLI_BETA_TARGET="stretch:default,dev"
+DESKTOP_BETA_TARGET=""
+#
+RECOMMENDED="Ubuntu_xenial_default_desktop_nightly:60,Debian_stretch_default_nightly:60"
+#
+BOARDRATING=""
+HARDWARE=""
+FORUMS="http://forum.armbian.com/index.php/forum/11-other-boards/"
+BUY=""

config/boards/firefly-rk3399.wip

@@ -0,0 +1,14 @@
+# Firefly RK3399 hexa core 4GB SoC eMMC GBE USB3 WiFi
+BOARD_NAME="Firefly RK3399"
+BOARDFAMILY="rk3399"
+BOOTCONFIG="firefly-rk3399_defconfig"
+#
+MODULES=""
+MODULES_NEXT=""
+#
+KERNEL_TARGET="default,dev"
+CLI_TARGET=""
+DESKTOP_TARGET=""
+
+CLI_BETA_TARGET=""
+DESKTOP_BETA_TARGET=""

config/boards/nanopct4.wip

@@ -0,0 +1,14 @@
+# NanoPC T4 hexa core 4GB SoC eMMC GBE USB3 WiFi
+BOARD_NAME="NanoPC T4"
+BOARDFAMILY="rk3399"
+BOOTCONFIG="nanopi4_defconfig"
+#
+MODULES=""
+MODULES_NEXT=""
+#
+KERNEL_TARGET="default,dev"
+CLI_TARGET="stretch:default"
+DESKTOP_TARGET="bionic:default"
+
+CLI_BETA_TARGET=""
+DESKTOP_BETA_TARGET=""

config/bootenv/qcomlt-default.txt

@@ -0,0 +1 @@
+verbosity=1