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-socfpga/clock_manager.c b/arch/arm/mach-socfpga/clock_manager.c
index 0a6025f..a4a97b6 100644
--- a/arch/arm/mach-socfpga/clock_manager.c
+++ b/arch/arm/mach-socfpga/clock_manager.c
@@ -4,6 +4,7 @@
  */
 
 #include <common.h>
+#include <command.h>
 #include <init.h>
 #include <wait_bit.h>
 #include <asm/io.h>
@@ -62,7 +63,8 @@
 }
 
 #ifndef CONFIG_SPL_BUILD
-static int do_showclocks(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+static int do_showclocks(struct cmd_tbl *cmdtp, int flag, int argc,
+			 char *const argv[])
 {
 	cm_print_clock_quick_summary();
 	return 0;