Disconnect EFI HTTP support

The EFI HTTP code has been causing boot failures for people, so disable it
while a fix is being worked on.

stand/efi/loader/conf.c

@@ -39,7 +39,6 @@ struct devsw *devsw[] = {
 	&efipart_fddev,
 	&efipart_cddev,
 	&efipart_hddev,
-	&efihttp_dev, /* ordering with efinet_dev matters */
 	&efinet_dev,
 	&vdisk_dev,
 #ifdef EFI_ZFS_BOOT
@@ -55,7 +54,6 @@ struct fs_ops *file_system[] = {
 	&dosfs_fsops,
 	&ufs_fsops,
 	&cd9660_fsops,
-	&efihttp_fsops,
 	&tftp_fsops,
 	&nfs_fsops,
 	&gzipfs_fsops,