Add more Microchip implementations

Signed-off-by: Michael Buesch <m@bues.ch>
attiny26dip20.ucf: Remove osc pin

Signed-off-by: Michael Buesch <m@bues.ch>
Rebuild bitfiles

Signed-off-by: Michael Buesch <m@bues.ch>
Mark M24Cxx I2C EEPROM as broken

Signed-off-by: Michael Buesch <m@bues.ch>