common: arm: freescale: layerscape: Move header files out of common.h

We should not have an arch-specific header file in common.h. Adjust the
board files a little so it is not needed, and drop it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/configs/ls2080a_common.h b/include/configs/ls2080a_common.h
index e311d0b..dbca05a 100644
--- a/include/configs/ls2080a_common.h
+++ b/include/configs/ls2080a_common.h
@@ -250,4 +250,6 @@
 
 #define CONFIG_SYS_BOOTM_LEN   (64 << 20)      /* Increase max gunzip size */
 
+#include <asm/arch/soc.h>
+
 #endif /* __LS2_COMMON_H */