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/smc911x_eeprom.c b/examples/standalone/smc911x_eeprom.c
index 8acfcb9..9bd9a6e 100644
--- a/examples/standalone/smc911x_eeprom.c
+++ b/examples/standalone/smc911x_eeprom.c
@@ -466,7 +466,7 @@
 /**
  *	smc911x_eeprom - our application's main() function
  */
-int smc911x_eeprom(int argc, char * const argv[])
+int smc911x_eeprom(int argc, char *const argv[])
 {
 	/* Avoid initializing on stack as gcc likes to call memset() */
 	struct eth_device dev;