more rt10xx fix

[hathach]

follow up to #220

• fix write address of rt1020/rt1024 0x60000000
• add uart to rt1020 rt1024
• fix rt1024 LED
• update rt1024 ld ram to match 1020
• fix write_tinyuf2_to_flash() to also include fcbb as well.

Note: RT1020EVK working great, but RT1024 has trouble with load code from internal qspi flash, probably misconfigured flash parameters or something. will create an separate issue to remind this.

Update: issue #231