Add -pkvm_experimental to the kernel prebuilt

Current name suggests that android14-6.1 GKI can be run as guest, which
is not true. Resolve this confusion by explicitly specifying
-pkvm_experimental to the name, which points out that this image was
built from the android14-6.1-pkvm_experimental branch.

Bug: 329383978
Test: AVF presubmit
Change-Id: Ib703a4d2fdc09bd83e63bdc9de01c393f097c9ea
1 file changed