board: purism: add the Purism Librem5 phone

Initial commit of Librem5 u-boot and SPL

Signed-off-by: Angus Ainslie <angus@akkea.ca>
Co-developed-by: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>
Signed-off-by: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>
Reviewed-by: Fabio Estevam <festevam@denx.de>
diff --git a/board/purism/librem5/Makefile b/board/purism/librem5/Makefile
new file mode 100644
index 0000000..47f25f0
--- /dev/null
+++ b/board/purism/librem5/Makefile
@@ -0,0 +1,13 @@
+#
+# Copyright 2017 NXP
+# Copyright 2019 Purism
+#
+# SPDX-License-Identifier:      GPL-2.0+
+#
+
+obj-y += librem5.o
+
+ifdef CONFIG_SPL_BUILD
+obj-y += spl.o
+obj-$(CONFIG_IMX8M_LPDDR4) += lpddr4_timing.o lpddr4_timing_b0.o
+endif