Took updated mcp3422 driver from latest IIO forgreg branch.  MCP3428 is used on the TS-8390.
Removed conflicting ipu2 mapping
Disabled unused wifi code
Added LCD 3.3V regulator
Added usable brightness values
Added touchscreen
Added I2C MCP3428 ADC for 8390
Removed FPGA CS for manual userspace control
Updated defconfig to support touchscreen + onboard ADC