thermal: imx_tmu: fix missing include

commit c05ed00afb dropped linux/delay.h from common header

add linux/delay.h to avoid compile warning here

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
diff --git a/drivers/thermal/imx_tmu.c b/drivers/thermal/imx_tmu.c
index 4ca2208..936068c 100644
--- a/drivers/thermal/imx_tmu.c
+++ b/drivers/thermal/imx_tmu.c
@@ -14,6 +14,7 @@
 #include <dm/device.h>
 #include <errno.h>
 #include <fuse.h>
+#include <linux/delay.h>
 #include <malloc.h>
 #include <thermal.h>