arm: mvebu: Add basic Armada 38x support

This patch adds support for the Marvell Armada 38x SoC family.

Supported peripherals are:
- UART
- Ethernet (mvneta)
- I2C
- SPI (including SPI NOR flash)

Tested on Marvell DB-88F6820-GP evaluation board.

Signed-off-by: Stefan Roese <sr@denx.de>
Tested-by: Kevin Smith <kevin.smith@elecsyscorp.com>
Tested-by: Dirk Eibach <dirk.eibach@gdsys.cc>
diff --git a/arch/arm/mach-mvebu/include/mach/cpu.h b/arch/arm/mach-mvebu/include/mach/cpu.h
index 297ac52..3b48460 100644
--- a/arch/arm/mach-mvebu/include/mach/cpu.h
+++ b/arch/arm/mach-mvebu/include/mach/cpu.h
@@ -56,6 +56,12 @@
 	CPU_ATTR_DEV_CS3 = 0x37,
 };
 
+enum {
+	MVEBU_SOC_AXP,
+	MVEBU_SOC_A38X,
+	MVEBU_SOC_UNKNOWN,
+};
+
 /*
  * Default Device Address MAP BAR values
  */
@@ -106,6 +112,7 @@
 unsigned int mvebu_sdram_bs(enum memory_bank bank);
 void mvebu_sdram_size_adjust(enum memory_bank bank);
 int mvebu_mbus_probe(struct mbus_win windows[], int count);
+int mvebu_soc_family(void);
 
 /*
  * Highspeed SERDES PHY config init, ported from bin_hdr