arcflash: Rename cpld_MOSI_sync to cpld_TXD_sync; make it harder to fail to enable comms because bitbang serial is enabled
arcflash: Rename cpld_MOSI_sync to cpld_TXD_sync; make it harder to fail to enable comms because bitbang serial is enabled

google/myelin-acorn-electron-hardware,google/myelin-acorn-electron-hardware,google/myelin-acorn-electron-hardware,google/myelin-acorn-electron-hardware,google/myelin-acorn-electron-hardware,google/myelin-acorn-electron-hardware