hv:fix violations of coding guideline C-ST-04

The coding guideline rule C-ST-04 requires that
a 'if' statement followed by one or more 'else if'
statement shall be terminated by an 'else' statement
which contains either appropriate action or a comment.

Tracked-On: #6776
Signed-off-by: Mingqiang Chi <mingqiang.chi@intel.com>
Acked-by: Anthony Xu <anthony.xu@intel.com>

hypervisor/boot/multiboot/multiboot.c

@@ -86,6 +86,8 @@ int32_t init_multiboot_info(uint32_t *registers)
 			ret = 0;
 		}
 #endif
+	} else {
+		/* Currently there are only multiboot and multiboot2 */
 	}
 	return ret;
 }