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/Kconfig b/board/purism/librem5/Kconfig
new file mode 100644
index 0000000..cf0f303
--- /dev/null
+++ b/board/purism/librem5/Kconfig
@@ -0,0 +1,15 @@
+if TARGET_LIBREM5
+
+config SYS_BOARD
+	default "librem5"
+
+config SYS_VENDOR
+	default "purism"
+
+config SYS_CONFIG_NAME
+	default "librem5"
+
+config IMX_CONFIG
+	default "board/purism/librem5/imximage-8mq-lpddr4.cfg"
+
+endif