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/board/gateworks/gw_ventana/gsc.c b/board/gateworks/gw_ventana/gsc.c
index 068f8cd..6d9565c 100644
--- a/board/gateworks/gw_ventana/gsc.c
+++ b/board/gateworks/gw_ventana/gsc.c
@@ -5,6 +5,7 @@
  * Author: Tim Harvey <tharvey@gateworks.com>
  */
 
+#include <command.h>
 #include <linux/errno.h>
 #include <common.h>
 #include <i2c.h>
@@ -176,8 +177,8 @@
 }
 
 #if defined(CONFIG_CMD_GSC) && !defined(CONFIG_SPL_BUILD)
-static int do_gsc_sleep(cmd_tbl_t *cmdtp, int flag, int argc,
-			char * const argv[])
+static int do_gsc_sleep(struct cmd_tbl *cmdtp, int flag, int argc,
+			char *const argv[])
 {
 	unsigned char reg;
 	unsigned long secs = 0;
@@ -218,7 +219,8 @@
 	return CMD_RET_FAILURE;
 }
 
-static int do_gsc_wd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+static int do_gsc_wd(struct cmd_tbl *cmdtp, int flag, int argc,
+		     char *const argv[])
 {
 	unsigned char reg;
 
@@ -257,7 +259,7 @@
 	return CMD_RET_SUCCESS;
 }
 
-static int do_gsc(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+static int do_gsc(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	if (argc < 2)
 		return gsc_info(1);