Staging: hv: vmbus: Get rid of the module dependency

Hyper-V modules can be built as part of the kernel (not just as modules).
Get rid of the module dependency in Kconfig.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>