clk_k210.c: Clean up how we handle nop

Now that sandbox has <asm/barrier.h> and defines nop() there we should
include that in our driver for clarity and then remove our local nop()
from <k210/pll.h>.

Signed-off-by: Tom Rini <trini@konsulko.com>
---
I can see that our ARM <asm/barriers.h> should be <asm/barrier.h> and
updated in a few other ways to match how the kernel is currently.  This
is not a big deal yet as this driver is only for sandbox for risc-v

Cc: Sean Anderson <seanga2@gmail.com>
2 files changed