[Feature request] Cubecell Pro (ASR6601) support

[VDowbensky]

It would be nice to consider supporting the ASR6601 (Cubecell Pro board, Ebyte E78 modules etc). ASR6601SE has more flash memory (256K) and RAM (64K) also has a hardware crypto accelerator. This could significantly expand the capabilities of the device.

[atomozero]

If Heltec sends me the board, I'd be happy to handle the porting myself. :)