It is used to provide name:value properties to the footer. Value can be
from a text in *.bp file or a binary file referenced via the `file`
prop. e.g.
```
avb_add_hash_footer {
...
props: [
{
name: "string_prop",
value: "string_value",
},
{
name: "binary_prop",
file: "a_binary_file_name",
},
],
}
```
This CL also adds a test for the module type which has been missing.
Bug: 256148237
Test: m nothing
Change-Id: Idf55b308c8ce760387c01a847846b42d1aebe4ea
This is used multiple times by Microdroid to generate signed images.
Test: build and microdroid tests
Bug: 234564414
Bug: 185115783
Change-Id: I7d0b2c9907913c8a42a02f9951f341d08b585b8e
