secure-boot: Add support for expanding encrypted partition

cip-core has supported to expand encrypted partition since:
https://gitlab.com/cip-project/cip-core/isar-cip-core/-/commit/284175c31c74b2f2e70287cca5d2b90c3e7199b2#a596f0da51fb6d5473e30793a141b927bf80cec6.

Signed-off-by: Li Hua Qian <[email protected]>

Author: huaqianli

kas/opt/secure-boot.yml

@@ -17,3 +17,6 @@ local_conf_header:
     IMAGER_INSTALL += "ebg-secure-boot-signer"
   secure-boot-fw-ver: |
     FIRMWARE_SECURE_VER ?= "0"
+  expand-before-encrypt: |
+    CRYPT_PARTITIONS:append = ":expand"
+