imx6: disable clock command and print_cpuinfo code in SPL

We do not use print_cpuinfo and clock command code in SPL,
disable it when building SPL image.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
diff --git a/arch/arm/mach-imx/cpu.c b/arch/arm/mach-imx/cpu.c
index 1017eb8..18205dc 100644
--- a/arch/arm/mach-imx/cpu.c
+++ b/arch/arm/mach-imx/cpu.c
@@ -25,7 +25,7 @@
 #include <fsl_esdhc.h>
 #endif
 
-#if defined(CONFIG_DISPLAY_CPUINFO)
+#if defined(CONFIG_DISPLAY_CPUINFO) && !defined(CONFIG_SPL_BUILD)
 static u32 reset_cause = -1;
 
 static char *get_reset_cause(void)
@@ -132,7 +132,7 @@
 }
 #endif
 
-#if defined(CONFIG_DISPLAY_CPUINFO)
+#if defined(CONFIG_DISPLAY_CPUINFO) && !defined(CONFIG_SPL_BUILD)
 
 const char *get_imx_type(u32 imxtype)
 {