The flash encryption on esp32p4 was broken due to code related
to key manager not being executed when key manager support was
disabled on esp32p4 target.
This commit fixes that behaviour
Additionally, the atomic env enablement for
key_mgr_ll_enable_peripheral_clock was fixed.
For ESP32-H2 case, the hardware k mode is always enforced through
efuse settings (done in startup code).
For ESP32-P4 case, the software k mode is not supported in the peripheral
itself and code was redundant.
