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/nios2/cpu/cpu.c b/arch/nios2/cpu/cpu.c
index 9008db6..756535a 100644
--- a/arch/nios2/cpu/cpu.c
+++ b/arch/nios2/cpu/cpu.c
@@ -5,6 +5,7 @@
  */
 
 #include <common.h>
+#include <command.h>
 #include <cpu.h>
 #include <cpu_func.h>
 #include <dm.h>
@@ -31,7 +32,7 @@
 }
 #endif
 
-int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int do_reset(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	disable_interrupts();
 	/* indirect call to go beyond 256MB limitation of toolchain */