Modify release tools to replace certs in MMAC files.

Added support to perform a string replace of specified
dev keys with release keys when using the release tool
scripts.

Signed-off-by: rpcraig <rpcraig@tycho.ncsc.mil>

(cherry picked from commit 817c574d753191c52acd5787da02bb853d4ac090)

Change-Id: I51be8d62945436d3f374f51867295c5b792d4b53
Bug: 11334314