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/drivers/power/axp818.c b/drivers/power/axp818.c
index 834919d..0531707 100644
--- a/drivers/power/axp818.c
+++ b/drivers/power/axp818.c
@@ -11,6 +11,7 @@
  */
 
 #include <common.h>
+#include <command.h>
 #include <errno.h>
 #include <asm/arch/gpio.h>
 #include <asm/arch/pmic_bus.h>
@@ -255,7 +256,7 @@
 	return 0;
 }
 
-int do_poweroff(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int do_poweroff(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	pmic_bus_write(AXP818_SHUTDOWN, AXP818_SHUTDOWN_POWEROFF);