[U-Boot] TPL max size for RK3288 ?

Hey,

So I was playing with how to make our linker scripts more re-usable and have the kinds of link error on excessive size checks that we find really useful to avoid introducing run time failures, and I found something. On rk3288 we don't size TPL_MAX_SIZE, only for rk3368. Is there a reasonable one to set here? Thanks!