board: presidio-asic: Add basic G3 engr. development board support

Add basic Presidio G3 engineering board support

Signed-off-by: Alex Nemirovsky <alex.nemirovsky@cortina-access.com>
diff --git a/board/cortina/presidio-asic/Makefile b/board/cortina/presidio-asic/Makefile
new file mode 100644
index 0000000..d167a15
--- /dev/null
+++ b/board/cortina/presidio-asic/Makefile
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier:	GPL-2.0+
+#
+# (C) Copyright 2020 Cortina-Access.Inc.
+#
+#
+
+obj-y	:= presidio.o
+obj-y	+= lowlevel_init.o