RISC-V: use generic serial.h

Fixes this from allmodconfig:

drivers/tty/serial/earlycon.c:27:10: fatal error: asm/serial.h: No such file or directory

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>