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/arch/arm/mach-rockchip/Kconfig b/arch/arm/mach-rockchip/Kconfig
index b9a026a..c556475 100644
--- a/arch/arm/mach-rockchip/Kconfig
+++ b/arch/arm/mach-rockchip/Kconfig
@@ -192,7 +192,7 @@
 	default 0x10300580 if ROCKCHIP_RV1108
 	default 0
 	help
-	  The Soc will enter to different boot mode(defined in asm/arch/boot_mode.h)
+	  The Soc will enter to different boot mode(defined in asm/arch-rockchip/boot_mode.h)
 	  according to the value from this register.
 
 config ROCKCHIP_SPL_RESERVE_IRAM