Staging: hv: hv_mouse: delete mouse_vsc.c

Move the mouse_vsc.c file into hv_mouse_drv.c as it makes
no sense to have two files here, as we don't have to worry about the
"closed vs. open" split that this code was originally written for.

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