fsl-layerscape: Rework usage of CONFIG_CLUSTER_CLK_FREQ

In the case where CONFIG_CLUSTER_CLK_FREQ is not defined, simply set
cluster_clk to get_board_sys_clk().

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/cpu/armv8/fsl-layerscape/fsl_lsch2_speed.c b/arch/arm/cpu/armv8/fsl-layerscape/fsl_lsch2_speed.c
index f18407b..4455eb1 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/fsl_lsch2_speed.c
+++ b/arch/arm/cpu/armv8/fsl-layerscape/fsl_lsch2_speed.c
@@ -48,10 +48,11 @@
 	unsigned long cluster_clk;
 
 	sys_info->freq_systembus = sysclk;
-#ifndef CONFIG_CLUSTER_CLK_FREQ
-#define CONFIG_CLUSTER_CLK_FREQ	get_board_sys_clk()
-#endif
+#ifdef CONFIG_CLUSTER_CLK_FREQ
 	cluster_clk = CONFIG_CLUSTER_CLK_FREQ;
+#else
+	cluster_clk = get_board_sys_clk();
+#endif
 
 #if defined(CONFIG_DYNAMIC_DDR_CLK_FREQ) || defined(CONFIG_STATIC_DDR_CLK_FREQ)
 	sys_info->freq_ddrbus = get_board_ddr_clk();