cmd: sbi: Correctly display unknown implementation IDs

For an unknown implementation ID an output like

    SBI 1.0Unknown implementation ID 16777216
    Extensions:
      sbi_set_timer
      ...

was shown. The number 16777216 is not the implementation ID.

* Show the correct number
* Use a hexadecimal output format
* Add a missing line feed

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>

cmd/riscv/sbi.c

@@ -99,7 +99,7 @@ static int do_sbi(struct cmd_tbl *cmdtp, int flag, int argc,
 			}
 		}
 		if (i == ARRAY_SIZE(implementations))
-			printf("Unknown implementation ID %ld", ret);
+			printf("\nUnknown implementation ID 0x%x", impl_id);
 	}
 	printf("\nMachine:\n");
 	ret = sbi_get_mvendorid(&mvendorid);