Merge "vm: DRY *Config structs w.r.t. aflags using cfg_if" into main am: 967a6860a6

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Virtualization/+/3253223

Change-Id: Id03e3ae1511f65fa0e1f854235d1e4a0ad09600b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>