ZTE MF286R modem support

[Hauke Mehrtens]

On 4/16/22 22:26, Lech Perczak wrote:
> Hello,
> 
> Recently my PR #9670 [1] which includes fixes needed to support built-in 
> modem of ZTE MF286R router was merged to master. The (incomplete) 
> support for MF286R landed together with MF286A before branching off 
> 22.03 release.
> I'd be grateful if fixes from [1] could be cherry-picked to 22.03, for 
> MF286R to have full support in that release.
> 
> Required commits are c99013e, b2940bb, ed79578 and e02fb42, a67629b is 
> optional, but would be beneficial if another variant of the modem is 
> found, with different interface configuration - that may require to 
> override the autodetection results. Also, skipping that patch can yield 
> merge conflicts.
> 
> [1] https://github.com/openwrt/openwrt/pull/9670
> 

Hi,

I ported the changes to OpenWrt 22.03 branch. I will also add the new 
change you posted some hours ago.

Hauke