arm: armada-xp: Add basic support for the maxBCM board

The maxBCM board is equipped with the Marvell Armada-XP MV78460 SoC. It
integrates an SPI NOR flash and an Marvell 88E6185 switch.

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/configs/maxbcm_defconfig b/configs/maxbcm_defconfig
new file mode 100644
index 0000000..4bcffd8
--- /dev/null
+++ b/configs/maxbcm_defconfig
@@ -0,0 +1,2 @@
+CONFIG_ARM=y
+CONFIG_TARGET_MAXBCM=y