[snp] Set EFI_SIMPLE_NETWORK_RECEIVE_MULTICAST bit as per UEFI spec

According to UEFI specification 2.8 p 24.1 we must set the
EFI_SIMPLE_NETWORK_RECEIVE_MULTICAST bit in the "Disable" mask, when
"ResetMCastFilter" is TRUE.

Signed-off-by: Ignat Korchagin <ignat@cloudflare.com>
Split-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/drivers/net/efi/snpnet.c

 	/* Try possible receive filters in turn */
 	for ( i = 0; i < ( sizeof ( filters ) / sizeof ( filters[0] ) ); i++ ) {
 		efirc = snp->snp->ReceiveFilters ( snp->snp, filters[i],
-						   0, TRUE, 0, NULL );
+				EFI_SIMPLE_NETWORK_RECEIVE_MULTICAST, TRUE,
+				0, NULL );
 		if ( efirc == 0 )
 			return 0;
 		rc = -EEFI ( efirc );