powerpc/5200: dts: digsy_mtc.dts: update to add can, pci, serial and spi

Add new nodes to describe more hardware the board is
equipped with:
 - two can nodes for SJA1000 on localbus
 - pci node to support Coral-PA graphics controller
 - serial node for SC28L92 DUART on localbus
 - spi node for MSP430 device

Also correct i2c eeprom node name.

Signed-off-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Anatolij Gustschin <agust@denx.de>