nRF54L15 zephyr-epaper example with ePaper Breakout board

[lboue]

@Toastee0

The board definitions do not support any sample that needs the dfu feature currently, nrf54L15_partition.dtsi needs to be adjusted to fit the memory only on the SOC.

The example provided in the official repository compiles correctly.
I don’t need OTA for zephyr-epaper example.