add support ota

hc

2023-02-18 a08c8b75ee83d7f62c9aefc23bfb42082aa4076c

 buildroot/board/rockchip/common/recovery/etc/init.d/S40_recovery
..
..
@@ -5,7 +5,12 @@
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 case "$1" in
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   start)
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+		echo host >/sys/devices/platform/fe8a0000.usb2-phy/otg_mode
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+		sleep 1
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 	  	touch /dev/.coldboot_done
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+		touch /.rkdebug
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+		umount /dev/sda1 
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+		mount /dev/sda1 /sdcard
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 		/usr/bin/recovery &
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 	;;