Drivers: hv: Rename the SynIC enable and disable routines

Drivers: hv: Rename the SynIC enable and disable routines

The confidential VMBus requires support for the both hypervisor
facing SynIC and the paravisor one.

Rename the functions that enable and disable SynIC with the
hypervisor. No functional changes.

Signed-off-by: Roman Kisel <romank@linux.microsoft.com>
Reviewed-by: Tianyu Lan <tiala@microsoft.com>
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>