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/x86/lib/bootm.c b/arch/x86/lib/bootm.c
index 0837655..1569d30 100644
--- a/arch/x86/lib/bootm.c
+++ b/arch/x86/lib/bootm.c
@@ -206,8 +206,8 @@
 				 images->os.arch == IH_ARCH_X86_64);
 }
 
-int do_bootm_linux(int flag, int argc, char * const argv[],
-		bootm_headers_t *images)
+int do_bootm_linux(int flag, int argc, char *const argv[],
+		   bootm_headers_t *images)
 {
 	/* No need for those on x86 */
 	if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)