cmd: sbi: formatting PolarFire Hart Software Services version

The 'PolarFire Hart Software Services' SBI implementation returns the
version of the incorporated OpenSBI. Format the number accordingly.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
diff --git a/cmd/riscv/sbi.c b/cmd/riscv/sbi.c
index 87f7966..bd9d9c4 100644
--- a/cmd/riscv/sbi.c
+++ b/cmd/riscv/sbi.c
@@ -81,6 +81,7 @@
 					break;
 				switch (impl_id) {
 				case 1: /* OpenSBI */
+				case 8: /* PolarFire Hart Software Services */
 					printf("%ld.%ld",
 					       vers >> 16, vers & 0xffff);
 					break;