[nrf noup] boot/zephyr: nrf54h20dk board support

Added basic support for nrf54h20dk_nrf54h20_cpuapp_iron board.
This commit turns off CONFIG_FPROTECT for this board build.

Signed-off-by: Michal Kozikowski <michal.kozikowski@nordicsemi.no>
(cherry picked from commit b404bb1)

Author: nordic-mik7

boot/zephyr/boards/nrf54h20dk_nrf54h20_cpuapp.conf

@@ -6,6 +6,9 @@
 # Ensure that the SPI NOR driver is disabled by default
 CONFIG_SPI_NOR=n
 
+# TODO: below are not yet supported and need fixing
+CONFIG_FPROTECT=n
+
 CONFIG_BOOT_WATCHDOG_FEED=n
 
 # Power domains forced on by default on boot, no need