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/board/gdsys/a38x/hydra.c b/board/gdsys/a38x/hydra.c
index fa50ad2..daade6d 100644
--- a/board/gdsys/a38x/hydra.c
+++ b/board/gdsys/a38x/hydra.c
@@ -1,4 +1,5 @@
 #include <common.h>
+#include <command.h>
 #include <console.h> /* ctrlc */
 #include <asm/io.h>
 
@@ -89,7 +90,7 @@
 #define REFL_PATTERN (0xdededede)
 #define REFL_PATTERN_INV (~REFL_PATTERN)
 
-int do_hydrate(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int do_hydrate(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	uint k = 0;
 	void __iomem *pcie2_base = (void __iomem *)(MVEBU_REG_PCIE_BASE +