Convert vintf_fragments into vintf_fragment module(s)

Convert vintf_fragments into vintf_fragment module(s) so those manifests
can be handled in the same way between KATI defined system image and
Soong defined system image.

Bug: 322089980
Test: aosp_cf_x86_64_phone build succeeded
Change-Id: I24f112edf32ea2d0146ebe1d95ba42be28552a6b
2 files changed