include/mtd.h: Cleanup usage

There are only a few things found in <mtd.h> today. Go through and audit
the C files which include <mtd.h> and remove it when not required. Then,
add it to the files which had either missed it or had an indirect
inclusion of it.

Signed-off-by: Tom Rini <trini@konsulko.com>

include/fwu.h

@@ -9,7 +9,6 @@
 #include <blk.h>
 #include <efi.h>
 #include <fwu_mdata.h>
-#include <mtd.h>
 #include <u-boot/uuid.h>
 
 #include <linux/types.h>