[PATCH] perf/amlogic: Fix build error for x86_64 allmodconfig

[Jiucheng Xu]

The driver misses including <linux/io.h>. It causes
compiling error "implicit declaration of function
'readl' and 'writel'" when make X86_64 allmodconfig.

Fixs: '2016e2113d35b ("perf/amlogic: Add support for
Amlogic meson G12 SoC DDR PMU driver")'
Signed-off-by: Jiucheng Xu <jiucheng.xu@xxxxxxxxxxx>
---
 drivers/perf/amlogic/meson_g12_ddr_pmu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/perf/amlogic/meson_g12_ddr_pmu.c b/drivers/perf/amlogic/meson_g12_ddr_pmu.c
index c07c34f03cce..932802abd18c 100644
--- a/drivers/perf/amlogic/meson_g12_ddr_pmu.c
+++ b/drivers/perf/amlogic/meson_g12_ddr_pmu.c
@@ -4,6 +4,7 @@
  */
 
 #include <linux/err.h>
+#include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of.h>
-- 
2.25.1