configs: mx6qsabre_common.h: Use default clock definitions

Since commit 50d4a707f0 (mx5/6: Define default SoC input clock frequencies)
we can use the default clock values.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>

include/configs/mx6qsabre_common.h

@@ -18,8 +18,6 @@
 #define __MX6QSABRE_COMMON_CONFIG_H
 
 #define CONFIG_MX6Q
-#define CONFIG_SYS_MX6_HCLK            24000000
-#define CONFIG_SYS_MX6_CLK32           32768
 #define CONFIG_DISPLAY_CPUINFO
 #define CONFIG_DISPLAY_BOARDINFO