[PATCH] microblaze: heartbeat: fix missing prom.h include

[Rob Herring]

Since commit 96f0e6fcc9ad ("microblaze: remove redundant early_printk
support") prom.h was removed and one instance in heartbeat.c remained.
Include of.h as it is the actual header needed.

Fixes: 96f0e6fcc9ad ("microblaze: remove redundant early_printk support")
Reported-by: kbuild test robot <lkp@xxxxxxxxx>
Cc: Michal Simek <monstr@xxxxxxxxx>
Signed-off-by: Rob Herring <robh@xxxxxxxxxx>
---
 arch/microblaze/kernel/heartbeat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/microblaze/kernel/heartbeat.c b/arch/microblaze/kernel/heartbeat.c
index 2022130139d2..87aa942eee8c 100644
--- a/arch/microblaze/kernel/heartbeat.c
+++ b/arch/microblaze/kernel/heartbeat.c
@@ -11,10 +11,10 @@
 #include <linux/sched.h>
 #include <linux/sched/loadavg.h>
 #include <linux/io.h>
+#include <linux/of.h>
 
 #include <asm/setup.h>
 #include <asm/page.h>
-#include <asm/prom.h>
 
 static unsigned int base_addr;
 
-- 
2.17.1