ANDROID: KVM: arm64: Add a range to the guest share/unshare hypercalls

Extend the guest share and unshare HVCs with a size argument. For ABI
compabitiliy with guests, a 0 range is treated as a single page, while
the range argument is advertised in the meminfo HVC.

Bug: 278749606
Bug: 243642516
Change-Id: Ic4927124282c430cf57f112eb96ea01740ff9967
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>