Revert "Change Armada XP kernel load address to the u-boot's end address"

This reverts commit 7166e1612f564f7f42e9dcebf9bdc9e8cd84de99.

u-boot for OpenBlocks AX3 uses RAM between 0MB and 14MB.
add debug print
add kernel configuration and DTS for OpenBlocks AX3-4
add SII S35390A RTC support
add Marvel Armada XP MV78260 mvs
[WIP] add SII EEPROM support
[WIP] add Marvell Armada XP GbE support