ACRN: update MAINTAINERS: mailing list is subscribers-only

Mark the acrn-dev mailing list as subscribers-only.

Evidence from a previous patch:
  acrn-dev@lists.projectacrn.org
    SMTP error from remote mail server after end of data:
    510 5.1.1 Your email address, rdunlap@infradead.org, is not subscribed to that group.

Cc: Shuo Liu <shuo.a.liu@intel.com>
Cc: acrn-dev@lists.projectacrn.org
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20210210183433.18746-1-rdunlap@infradead.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

MAINTAINERS

@@ -438,7 +438,7 @@ F:	include/uapi/linux/wmi.h
 
 ACRN HYPERVISOR SERVICE MODULE
 M:	Shuo Liu <shuo.a.liu@intel.com>
-L:	acrn-dev@lists.projectacrn.org
+L:	acrn-dev@lists.projectacrn.org (subscribers-only)
 S:	Supported
 W:	https://projectacrn.org
 F:	Documentation/virt/acrn/