utils: Add the omnia-eeprom utility
Add a new utility, `omnia-eeprom`, which can be used to print / set
EEPROM fields on Turris Omnia.
One example when this utility might be useful is if the board
experiences random crashes due to newer versions of the DDR training
algorithm in newer U-Boot. The user can change the DDR speed from 1600K
to 1333H to solve these issues, with
```
omnia-eeprom set ddr_speed 1333H
```
Signed-off-by: Marek Behún <kabel@kernel.org>
Link: https://github.com/openwrt/openwrt/pull/16264
Signed-off-by: Robert Marko <robimarko@gmail.com>
(cherry picked from commit
749a43325b98afe4430fa7e2f23ac3ee44791ad6)
Link: https://github.com/openwrt/openwrt/pull/17097
Signed-off-by: Petr Štetiar <ynezz@true.cz>