common: fdt_support: Remove check for mtdparts in fdt_fixup_mtdparts

fdt_fixup_mtdparts currently does nothing when partition info is
runtime-generated or compiled-in defaults are used.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Fix nits in commit message:
Signed-off-by: Simon Glass <sjg@chromium.org>

common/fdt_support.c

@@ -903,14 +903,9 @@ void fdt_fixup_mtdparts(void *blob, void *node_info, int node_info_size)
 {
 	struct node_info *ni = node_info;
 	struct mtd_device *dev;
-	char *parts;
 	int i, idx;
 	int noff;
 
-	parts = getenv("mtdparts");
-	if (!parts)
-		return;
-
 	if (mtdparts_init() != 0)
 		return;