arch/riscv: copy read/write8/16/32 from x86

Change-Id: I12de8f82499074f0fbbc1c09210b00c6a9614c1b
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-on: https://review.coreboot.org/15146
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
1 file changed