This fixes warnings that 'isom' can only be a compatible instead of major brand. Issue #755.
Added --crypt_byte_block, --skip_byte_block to allow users to specify protection pattern other than 1:9 for pattern based encryption scheme, e.g. cbcs and cens. Closes #710. b/147307451 Change-Id: I9f64a7639170c737f138572689b28d17286325c7