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/arch/arm/mach-imx/cmd_hdmidet.c b/arch/arm/mach-imx/cmd_hdmidet.c
index 6aa7d82..e2571ad 100644
--- a/arch/arm/mach-imx/cmd_hdmidet.c
+++ b/arch/arm/mach-imx/cmd_hdmidet.c
@@ -3,11 +3,13 @@
  * Copyright (C) 2012 Boundary Devices Inc.
  */
 #include <common.h>
+#include <command.h>
 #include <asm/arch/imx-regs.h>
 #include <asm/arch/mxc_hdmi.h>
 #include <asm/io.h>
 
-static int do_hdmidet(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+static int do_hdmidet(struct cmd_tbl *cmdtp, int flag, int argc,
+		      char *const argv[])
 {
 	struct hdmi_regs *hdmi	= (struct hdmi_regs *)HDMI_ARB_BASE_ADDR;
 	return (readb(&hdmi->phy_stat0) & HDMI_DVI_STAT) ? 0 : 1;