Patch merged into coreboot/master: qemu-riscv: Remove obsolete CSR - send_ipi

the following patch was just integrated into master:
commit 5861b585e70167a61ed324a94274204e7c3ad5b3
Author: Martin Roth 
Date:   Wed Aug 17 21:51:28 2016 -0600

qemu-riscv: Remove obsolete CSR - send_ipi

This aligns the code in qemu-riscv with the code in spike-riscv.
    The previous code gives an error in the updated toolchain as the
    send_ipi CSR is no longer valid.

This gave the build error:
    src/mainboard/emulation/qemu-riscv/qemu_util.c:64:
       Error: Instruction csrw requires absolute expression

Change-Id: Iac0f66e8e9935f45c8094d5e16bedb7ac5225424
    Signed-off-by: Martin Roth 
    Reviewed-on: https://review.coreboot.org/16244
    Tested-by: build bot (Jenkins)
    Reviewed-by: Paul Menzel 
    Reviewed-by: Ronald G. Minnich 
    Reviewed-by: Jonathan Neuschäfer

See https://review.coreboot.org/16244 for details.

-gerrit