pia35x: u-boot: added buddy variable for expansion board piA_Messverstaerker
pia35x: activated input on SPI2_SOMI

Signed-off-by: Marian Lüder <m.lueder@pironex.de>
pia35x: removed space at end of line

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