command: Remove the cmd_tbl_t typedef

We should not use typedefs in U-Boot. They cannot be used as forward
declarations which means that header files must include the full header to
access them.

Drop the typedef and rename the struct to remove the _s suffix which is
now not useful.

This requires quite a few header-file additions.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/cmd/fitupd.c b/cmd/fitupd.c
index 1e5edd9..f6270d9 100644
--- a/cmd/fitupd.c
+++ b/cmd/fitupd.c
@@ -12,7 +12,8 @@
 #error "CONFIG_UPDATE_TFTP required"
 #endif
 
-static int do_fitupd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+static int do_fitupd(struct cmd_tbl *cmdtp, int flag, int argc,
+		     char *const argv[])
 {
 	ulong addr = 0UL;