cmd: sbi: add bhyve SBI implementation ID

Bhyve is the hypervisor used by FreeBSD.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
diff --git a/cmd/riscv/sbi.c b/cmd/riscv/sbi.c
index 5ecf567..b013c8c 100644
--- a/cmd/riscv/sbi.c
+++ b/cmd/riscv/sbi.c
@@ -30,6 +30,7 @@
 	{ 8, "PolarFire Hart Software Services" },
 	{ 9, "coreboot" },
 	{ 10, "oreboot" },
+	{ 11, "bhyve" },
 };
 
 static struct sbi_ext extensions[] = {