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/examples/standalone/atmel_df_pow2.c b/examples/standalone/atmel_df_pow2.c
index b7bd243..b71b406 100644
--- a/examples/standalone/atmel_df_pow2.c
+++ b/examples/standalone/atmel_df_pow2.c
@@ -115,7 +115,7 @@
 	}
 }
 
-int atmel_df_pow2(int argc, char * const argv[])
+int atmel_df_pow2(int argc, char *const argv[])
 {
 	/* Print the ABI version */
 	app_startup(argv);