pia-am335x: print EEPROM configuration flags

- show the optional flags as well
- always printout the eeprom configuration, not only in debug mode

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>
pia-am335x: don't run tps init twice and before board was identified

- only run init_tps65910() in board init
- check if the RTC is running after turning it on

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>
pia-am335x: update test function for POE

- enable PoE in test function for E2 board
- check TPS RTC only for MMI board

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>
pia-am335x: add support for LCD eeproms

- rework eeprom writing function to be called more than once
- add support for eeproms on expansion or lcd boards
- add support for KM MMI LCD board

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>