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/powerpc/cpu/mpc83xx/ecc.c b/arch/powerpc/cpu/mpc83xx/ecc.c
index a6eb7cb..1343dd3 100644
--- a/arch/powerpc/cpu/mpc83xx/ecc.c
+++ b/arch/powerpc/cpu/mpc83xx/ecc.c
@@ -96,7 +96,7 @@
 	       ddr->capture_attributes & ECC_CAPT_ATTR_VLD);
 }
 
-int do_ecc(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
+int do_ecc(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
 #ifdef CONFIG_SYS_FSL_DDR2