fru: ops: Add support to read mac addresses from multirecord

fru: ops: Add support to read mac addresses from multirecord

Add support to read MAC addresses from mac address multirecord.
Check if multi record is found, then jump to mac address multirecord by
comparing the record type field. If it matches mac address
multirecord(0xD2), then copy mac addresses.

Copy these read MAC address in xilinx_read_eeprom_fru so that they are
updated to eth*addr in board_late_init_xilinx().

Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/18f31bc528820934854ea5fd9dc581778fc1e40c.1645624855.git.michal.simek@xilinx.com