ath79: add patch to fix serial console and sysupgrade on OR750 #2512
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The serial console on the Joy-IT OR750i doesn't work, because the UART
node is disabled in device tree. This also breaks sysupgrade.
The issue is already fixed upstream in OpenWRT by
7054721cf94f4aa8fe71ac4c28c922b19a69ba1d ("ath79: enable UART in SoC
DTSI files"), but since 19.07 doesn't support the OR750, we need our own
patch.
Signed-off-by: Nico Boehr freifunk@nicoboehr.de