ANDROID: KVM: arm64: Flush the vcpu iflags for non-protected VMs

The iflags are meant as input flags to the hypervisor, and will
be used in future patches by calls to functions that sync debug
and pmu state. Ensure that the hyp_vcpu copy is up-to-date with
the host's on entry.

Bug: 357781595
Change-Id: Id04d65ee084c3745ddc283ff5e30348511a4a1d2
Signed-off-by: Fuad Tabba <tabba@google.com>