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/firmware/psci.c b/drivers/firmware/psci.c
index 394f30f..572abfa 100644
--- a/drivers/firmware/psci.c
+++ b/drivers/firmware/psci.c
@@ -7,6 +7,7 @@
  */
 
 #include <common.h>
+#include <command.h>
 #include <dm.h>
 #include <irq_func.h>
 #include <dm/lists.h>
@@ -131,7 +132,7 @@
 #endif /* CONFIG_PSCI_RESET */
 
 #ifdef CONFIG_CMD_POWEROFF
-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[])
 {
 	do_psci_probe();