riscv: Remove common.h usage

We can remove common.h from most cases of the code here, and only a few
places need an additional header instead.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Rick Chen <rick@andestech.com>

arch/riscv/lib/smp.c

@@ -4,7 +4,6 @@
  * Lukas Auer <lukas.auer@aisec.fraunhofer.de>
  */
 
-#include <common.h>
 #include <cpu_func.h>
 #include <dm.h>
 #include <asm/barrier.h>