Added explicit wait for key manager state to be idle before configuring
the register for flash encryption key usage from efuse. This now ensures
that flash contents are encrypted using efuse programmed key.
Also refactored code a bit to move into target specific directory.
The flash encryption on esp32p4 was broken due to some 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.
Currently, when flash encryption is enabled, the whole partition gets encrypted.
This can be optimised by encrypting only the app image instead of encrypting the whole partition.
Closes https://github.com/espressif/esp-idf/issues/12576
This commit fixes issue where empty (unprogrammed) digest slot out of
multiple supported (e.g. 3 for ESP32-C3) could cause issue in
workflow enablement process.
Notes:
1. This issue was applicable for chips supporting "secure-boot-v2"
scheme with multiple digests slots
2. This issue was affecting only manual workflow, where digest of
public was pre-flashed in efuse
3. Change in "flash_encrypt.c" is only for additional safety purpose
