ARM: at91: Remove hardware.h included in configs

As said in READRE.kconfig, include/configs/*.h will be removed
after all options are switched to Kconfig. As the first step,
remove the follow line from include/configs/*.h.

 #include <asm/hardware.h>

Signed-off-by: Wenyou Yang <wenyou.yang@microchip.com>
diff --git a/include/configs/sama5d2_xplained.h b/include/configs/sama5d2_xplained.h
index aedd568..7b75413 100644
--- a/include/configs/sama5d2_xplained.h
+++ b/include/configs/sama5d2_xplained.h
@@ -16,7 +16,7 @@
 
 /* SDRAM */
 #define CONFIG_NR_DRAM_BANKS		1
-#define CONFIG_SYS_SDRAM_BASE           ATMEL_BASE_DDRCS
+#define CONFIG_SYS_SDRAM_BASE           0x20000000
 #define CONFIG_SYS_SDRAM_SIZE		0x20000000
 
 #ifdef CONFIG_SPL_BUILD