arm: mvebu: Move SoC selection (A38X vs AXP) into Kconfig

Until now, the SoC selection for the ARCH_MVEBU platforms has been done
in the config header. Using CONFIG_ARMADA_XP in a non-clear way. As
it needed to get selected for AXP and A38x based boards. This patch
now changes this to move the SoC selection to Kconfig. And also
uses CONFIG_ARCH_MVEBU as a common define for both AXP and A38x.
This makes things a bit clearer - especially for new board additions.

Additionally the defines CONFIG_SYS_MVEBU_DDR_AXP and
CONFIG_SYS_MVEBU_DDR_A38X are replaced with the already available
CONFIG_ARMADA_38X and CONFIG_ARMADA_XP.

And CONFIG_DDR3 is removed, as its not referenced anywhere.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Luka Perkov <luka.perkov@sartura.hr>
diff --git a/arch/arm/mach-mvebu/dram.c b/arch/arm/mach-mvebu/dram.c
index 059151a..a8ec5ea 100644
--- a/arch/arm/mach-mvebu/dram.c
+++ b/arch/arm/mach-mvebu/dram.c
@@ -12,11 +12,8 @@
 #include <asm/arch/cpu.h>
 #include <asm/arch/soc.h>
 
-#ifdef CONFIG_SYS_MVEBU_DDR_A38X
-#include "../../../drivers/ddr/marvell/axp/xor.h"
-#include "../../../drivers/ddr/marvell/axp/xor_regs.h"
-#endif
-#ifdef CONFIG_SYS_MVEBU_DDR_AXP
+#if defined(CONFIG_ARCH_MVEBU)
+/* Use common XOR definitions for A3x and AXP */
 #include "../../../drivers/ddr/marvell/axp/xor.h"
 #include "../../../drivers/ddr/marvell/axp/xor_regs.h"
 #endif
@@ -112,7 +109,7 @@
 	mvebu_sdram_bs_set(bank, size);
 }
 
-#if defined(CONFIG_SYS_MVEBU_DDR_A38X) || defined(CONFIG_SYS_MVEBU_DDR_AXP)
+#if defined(CONFIG_ARCH_MVEBU)
 static u32 xor_ctrl_save;
 static u32 xor_base_save;
 static u32 xor_mask_save;
@@ -292,7 +289,7 @@
 	}
 }
 
-#if defined(CONFIG_ARMADA_XP)
+#if defined(CONFIG_ARCH_MVEBU)
 void board_add_ram_info(int use_default)
 {
 	struct sar_freq_modes sar_freq;