Integrate meta-seco-rk/u-boot-seco_2017_09_next/niccolor/px30-d23

Commit: edgehog/layers/seco/meta-seco-rk@1959b009

Integrate u-boot-seco-rk/niccolor/px30-d23

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Commit: edgehog/bsp/rockchip/u-boot-seco-rk@29f057a8

[PX30][D23] Add board initialization as in seco_2017.09

See branch seco_2017.09 for original version

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Commit: edgehog/bsp/rockchip/u-boot-seco-rk@650bbc9b

[PX30][DTS][EEPROM] Remove the definition of eeprom in dts

The address of the eeprom changes in the various revisions

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Commit: edgehog/bsp/rockchip/u-boot-seco-rk@cf18176f

[PX30][D23] Add support for all the board revisions

See branch seco_2017.09 for original version

Board revision depends from the address of the eeprom wich can be 0x50, 0x51, 0x52, 0x53. there are configurations where 0x51 is used as address for RTC. 0x51 can be the address of the eeprom only if the probe of the others addresses don't work

Update get_macaddress_from_eeprom for use the correct eeprom address depending on the board revision