options: add category/group to random_generator/random_distribution

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/options.c b/options.c
index db02194..eab22a7 100644
--- a/options.c
+++ b/options.c
@@ -1630,6 +1630,8 @@
 			    .help = "Variable length LFSR",
 			  },
 		},
+		.category = FIO_OPT_C_IO,
+		.group	= FIO_OPT_G_RANDOM,
 	},
 	{
 		.name	= "random_distribution",
@@ -1652,6 +1654,8 @@
 			    .help = "Pareto distribution",
 			  },
 		},
+		.category = FIO_OPT_C_IO,
+		.group	= FIO_OPT_G_RANDOM,
 	},
 	{
 		.name	= "nrfiles",