rockchip: rk322x: update MACRO for back-to-brom

The MACRO has been update after:
ee14d29d rockchip: back-to-bootrom: split BACK_TO_BOOTROM for TPL/SPL
We need to update the C code for it.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

arch/arm/mach-rockchip/rk322x-board-spl.c

@@ -95,7 +95,7 @@ void board_init_f(ulong dummy)
 
 	/* Disable the ddr secure region setting to make it non-secure */
 	rk_clrreg(SGRF_DDR_CON0, 0x4000);
-#if defined(CONFIG_ROCKCHIP_SPL_BACK_TO_BROM) && !defined(CONFIG_SPL_BOARD_INIT)
+#if defined(CONFIG_SPL_ROCKCHIP_BACK_TO_BROM) && !defined(CONFIG_SPL_BOARD_INIT)
 	back_to_bootrom(BROM_BOOT_NEXTSTAGE);
 #endif
 }