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/spi.c b/cmd/spi.c
index bfa185b..aec9121 100644
--- a/cmd/spi.c
+++ b/cmd/spi.c
@@ -97,7 +97,7 @@
  * The command prints out the hexadecimal string received via SPI.
  */
 
-int do_spi (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int do_spi(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	char  *cp = 0;
 	uchar tmp;