fsverity_init: remove unneeded functionality

The --load-extra-key option to 'fsverity_init' was only used by odsign,
and --lock was only used by init.rc.  Since these uses have been
removed, remove the code that implemented these options as well.

Bug: 290064770
Test: presubmit
Change-Id: Iaad4b78926748f24dcaddecb27dc28e4c659a574
1 file changed