rockchip: use 'arch-rockchip' as header file path

Rockchip use 'arch-rockchip' instead of arch-$(SOC) as common
header file path, so that we can get the correct path directly.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
diff --git a/drivers/pwm/rk_pwm.c b/drivers/pwm/rk_pwm.c
index 9994cba..88db294 100644
--- a/drivers/pwm/rk_pwm.c
+++ b/drivers/pwm/rk_pwm.c
@@ -12,7 +12,7 @@
 #include <regmap.h>
 #include <syscon.h>
 #include <asm/io.h>
-#include <asm/arch/pwm.h>
+#include <asm/arch-rockchip/pwm.h>
 #include <power/regulator.h>
 
 struct rk_pwm_priv {