staging: unisys: visorbus: Rename #define VMCALL_IO_CONTROLVM_ADDR

Rename #define VMCALL_IO_CONTROLVM_ADDR to VMCALL_CONTROLVM_ADDR, as this
vmcall can be used by any partition, not just the IO partition.

Signed-off-by: David Binder <david.binder@unisys.com>
Signed-off-by: David Kershner <david.kershner@unisys.com>
Reviewed-by: Tim Sell <timothy.sell@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>