Accton powerpc platforms: Sync u-boot sys_eeprom to latest code

The platforms are including:
- AS4600_54T
- AS5600_52X
- AS5610_52X
- AS5710_54X
- AS6700_32X
- AS6701_32X
- AS6710_32X

Signed-off-by: Curt Brune <curt@cumulusnetworks.com>
u-boot sys_eeprom: Revise 0x29 TLV name to 'ONIE Version'

Signed-off-by: Curt Brune <curt@cumulusnetworks.com>
busybox sys_eeprom: Revise 0x29 TLV name to 'ONIE Version'

Signed-off-by: Curt Brune <curt@cumulusnetworks.com>