This is part of the work to rename boot_image to bootclasspath_fragment
which is being done for two reasons:
1. To avoid clashing with the bootimg module type.
2. To better reflect what this represents.
While a bootclasspath_fragment can create what ART calls a boot image
(which is different to what the bootimg module type represents) it does
not have to do so.
Bug: 177892522
Test: m nothing
Change-Id: Ib45604be7adc790ded9e27a2ac812dd7522ca8db
Adds a boot_image module type. Follow on changes will add instances of
boot_image to represent the ART and framework boot images in the art
and frameworks/base repositories respectively.
For the moment they retrieve their associated boot image configuration
from the map returned by genBootImageConfigs() and leave the actual
work of creating the ninja rules to create the boot images to the
dex_bootjars singleton.
Bug: 177892522
Test: m droid
Change-Id: Ib69701de0d24d996bb8e8be7a20b941be907390e
