dm: cpu: Fix undefined ENOSYS build error

Include <errno.h> otherwise ENOSYS is undefined.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/common/cmd_cpu.c b/common/cmd_cpu.c
index c3e229f..b4af64f5 100644
--- a/common/cmd_cpu.c
+++ b/common/cmd_cpu.c
@@ -9,6 +9,7 @@
 #include <command.h>
 #include <cpu.h>
 #include <dm.h>
+#include <errno.h>
 
 static const char *cpu_feature_name[CPU_FEAT_COUNT] = {
 	"L1 cache",
diff --git a/drivers/cpu/cpu-uclass.c b/drivers/cpu/cpu-uclass.c
index ab18ee2..aa0267c 100644
--- a/drivers/cpu/cpu-uclass.c
+++ b/drivers/cpu/cpu-uclass.c
@@ -8,6 +8,7 @@
 #include <common.h>
 #include <cpu.h>
 #include <dm.h>
+#include <errno.h>
 #include <dm/lists.h>
 #include <dm/root.h>