ARM: pia335x: fix UART0 pin muxing

- UART0 was not correctly initialized
- EEPROM has not been read yet even though we tried to mux based on the
  board id

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>
ARM: pia335x: disable evm check for default MPU PLL freq

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>
ARM: pia335x: enable NAND init only for E2 variant of the board

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>
Merge remote-tracking branch 'github/pia-am335x-mmi-dev' into pia-am335x-mmi-ml
ARM: am335x_pia: disable PIA_KM defines and do switching via boards.cfg

- PIA_E2 and PIA_MMI are defined depending on board configuration
- use am335x_pia_config for E2 board
- use am335x_pia_mmi_config for MMI board

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>
Merge remote-tracking branch 'github/pia-am335x-mmi-dev' into pia-am335x-mmi-ml
ARM: pia335x: uboot: removed debug info

Signed-off-by: Marian Lüder <m.lueder@pironex.de>
ARM: pia335x: uboot: removed NAND-configuration for board KM_MMI

Signed-off-by: Marian Lüder <m.lueder@pironex.de>