vmw_balloon: update maintainers list

Philip Moltman is no longer a maintainer of the VMware balloon. Setting
Nadav Amit as one instead.
Reviewed-by: NXavier Deguillard <xdeguillard@vmware.com>
Signed-off-by: NNadav Amit <namit@vmware.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

MAINTAINERS

@@ -15302,7 +15302,7 @@ F:	include/linux/vme*
 
 VMWARE BALLOON DRIVER
 M:	Xavier Deguillard <xdeguillard@vmware.com>
-M:	Philip Moltmann <moltmann@vmware.com>
+M:	Nadav Amit <namit@vmware.com>
 M:	"VMware, Inc." <pv-drivers@vmware.com>
 L:	linux-kernel@vger.kernel.org
 S:	Maintained