Add support for hi-speed uart at MT76x8 boards

Hey to all,
I spotted there is newer serial driver for MT76x8 CPUs for U-BOOT and I would like to port this feature to standard OpenWrt.
Maybe somebody can help / suggest right way to include this driver to current OpenWrt build. I'm building OpenWrt on Ubuntu virtual machine, so I'm able to play with, however I don't know where to start :slight_smile:

What I would like to get is support for higher baud-rates. MT7688 can go easily to 921600 (based on datasheet), however standard driver does not support it properly.

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