Hide unused options in header-abi-linker help message

This commit hides unused options "-rng-seed=<seed>" and "-version" in
header-abi-linker's help message.

Test: m header-abi-linker && header-abi-linker -help
Change-Id: I2f52090ca881e8177ccea5469a356a800ed94b9b
1 file changed