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/mpc86xx/mp.c b/arch/powerpc/cpu/mpc86xx/mp.c
index 07c4c07..08d11ad 100644
--- a/arch/powerpc/cpu/mpc86xx/mp.c
+++ b/arch/powerpc/cpu/mpc86xx/mp.c
@@ -67,7 +67,7 @@
 	return 0;
 }
 
-int cpu_release(u32 nr, int argc, char * const argv[])
+int cpu_release(u32 nr, int argc, char *const argv[])
 {
 	/* dummy function so common/cmd_mp.c will build
 	 * should be implemented in the future */