android: allow to provide metada for any DT source

Dttable format is going to be supported for boot/vendor_boot,
so metadata can be used

Bug: 405201147
Test: pineapple
Change-Id: I824baf24a21e99e4f7fc6f7e1c0ed764eb86824f
Signed-off-by: Dmitrii Merkurev <dimorinny@google.com>