arm64: zynqmp: Add nvmem alises for eeproms

Use nvmem alias to point to eeprom memory which contains information about
board. The change is done based on discussion in the link below.

Link: https://lore.kernel.org/r/CAL_JsqLMDqpkyg-Q7mUfw-XH67-v068Q6e9wTq2UOoN=0-_coQ@mail.gmail.com


Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/9b860b47ec3ca64340b4d29317e92b667236d7d1.1623684253.git.michal.simek@xilinx.com