sunxi: use fwtool for checking sdcard images

To achieve this, device tree compatible string was used as boardname and
the value of it will be checked against supported_devices list.

It should be noted that we do not distinguish between
sun5i-a13-olimex-som and sun5i-a13-olinuxino as they share the same dts
file.

The other thing is that we need to gunzip the generated firmware to do
fwtool check.

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

target/linux/sunxi/base-files/lib/preinit/01_preinit_sunxi.sh

@@ -1,9 +0,0 @@
-#!/bin/sh
-
-do_sunxi() {
-        . /lib/sunxi.sh
-
-        sunxi_board_detect
-}
-
-boot_hook_add preinit_main do_sunxi

target/linux/sunxi/base-files/lib/preinit/02_b53_hack.sh

@@ -4,7 +4,7 @@
 do_b53_hack() {
 	# hack: enable switch on Lamobo R1 and reset counters
 	case "$( sunxi_board_name )" in
-	"lamobo-r1")
+	"lamobo,lamobo-r1")
 		ifconfig eth0 up
 		sleep 1
 		swconfig dev switch0 set reset 1