Export partition specific security patches to soong

These are used as inputs to avb when building the img files.

Boot and Init_boot security patches will likely need to be
exported in the future as well (I have not tested bit-identical files
for these partitions yet).

Test: presubmits
Bug: 383357338
Change-Id: Id2c5102d8a0b389754a2410b419e8e05be721b48