cmd: fs: Add generic rm implementation

Add generic implementation of the 'rm' command to delete files
from filesystems using the generic filesystem API.

Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Marek Vasut <marex@denx.de>
diff --git a/cmd/fs.c b/cmd/fs.c
index bccc3a1..7f1ab8f 100644
--- a/cmd/fs.c
+++ b/cmd/fs.c
@@ -99,6 +99,20 @@
 	"      device type 'interface' instance 'dev'."
 );
 
+static int do_rm_wrapper(struct cmd_tbl *cmdtp, int flag, int argc,
+			 char *const argv[])
+{
+	return do_rm(cmdtp, flag, argc, argv, FS_TYPE_ANY);
+}
+
+U_BOOT_CMD(
+	rm,	4,	1,	do_rm_wrapper,
+	"delete a file",
+	"<interface> [<dev[:part]>] <filename>\n"
+	"    - delete a file with the name 'filename' on\n"
+	"      device type 'interface' instance 'dev'."
+);
+
 static int do_fstype_wrapper(struct cmd_tbl *cmdtp, int flag, int argc,
 			     char *const argv[])
 {