Generate vendor_boot-chd_debug.img while building CHD

Call build_chd_debug_ramdisk while building CHD so that the
vendor_boot-chd_debug.img could be automatically generated
in CI.

Bug: 317942272
Test: build_cf_hybrid_device
Change-Id: I69a3cdbfd07f37b37929575d6fe5145e1da74c4e
2 files changed