icE1usb fw/gps: Use ericsson GPS 02/03 on aux uart

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Change-Id: Ia90d4e537445be2e037807c681d41e2d8f2759e2
diff --git a/firmware/ice40-riscv/icE1usb/Makefile b/firmware/ice40-riscv/icE1usb/Makefile
index f385408..513329c 100644
--- a/firmware/ice40-riscv/icE1usb/Makefile
+++ b/firmware/ice40-riscv/icE1usb/Makefile
@@ -57,6 +57,7 @@
 	ice1usb_proto.h \
 	i2c.h \
 	misc.h \
+	rs422.h \
 	usb_desc_ids.h \
 	usb_dev.h \
 	usb_e1.h \
@@ -72,6 +73,7 @@
 	gpsdo.c \
 	i2c.c \
 	misc.c \
+	rs422.c \
 	usb_desc_app.c \
 	usb_dev.c \
 	usb_e1.c \