Let's add the missing header to fix the reported build-errors.

Fixes: df4e9ec1ed86 ("pmdomain: mediatek: Add support for secure HWCCF infra power on")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202510231317.ZZxNaFG0-lkp@intel.com/
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
---
 drivers/pmdomain/mediatek/mtk-pm-domains.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pmdomain/mediatek/mtk-pm-domains.c b/drivers/pmdomain/mediatek/mtk-pm-domains.c
index ac144ab8fce0..164c6b519af3 100644
--- a/drivers/pmdomain/mediatek/mtk-pm-domains.c
+++ b/drivers/pmdomain/mediatek/mtk-pm-domains.c
@@ -2,6 +2,7 @@
 /*
  * Copyright (c) 2020 Collabora Ltd.
  */
+#include <linux/arm-smccc.h>
 #include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/init.h>
-- 
2.43.0