configs/microchip_sama5d2_icp: new defconfigs

Add the new SAMA5D2 ICP (Industrial Connectivity Board)
with linux4sam_2020.10 components.
Update README file with new defconfigs.

https://www.linux4sam.org/bin/view/Linux4SAM/Sama5d2IcpMainPage

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

board/microchip/sama5d2_icp/genimage.cfg

@@ -0,0 +1,31 @@
+# Image for SD card boot on Microchip SAMA5D2 ICP (Industrial Connectivity Platform)
+#
+image boot.vfat {
+	vfat {
+		files = {
+			"zImage",
+			"at91-sama5d2_icp.dtb",
+			"boot.bin",
+			"u-boot.bin"
+		}
+	}
+	size = 16M
+}
+
+image sdcard.img {
+	hdimage {
+	}
+
+	partition boot {
+		partition-type = 0xC
+		bootable = "true"
+		image = "boot.vfat"
+		offset = 1M
+	}
+
+	partition rootfs {
+		partition-type = 0x83
+		image = "rootfs.ext4"
+		size = 512M
+	}
+}