FreeBSD/src 01cd6fb (r342097)sys/riscv/conf QEMU

Add a QEMU config for RISC-V.

Reviewed by:    jhb
MFC after:      1 week
Sponsored by:   The FreeBSD Foundation
Differential Revision:  https://reviews.freebsd.org/D18560
DeltaFile
+9-0sys/riscv/conf/QEMU
+9-01 files

UnifiedSplitRaw