rauc: Fix board-specific properties

The botloader and the compatibility strings were not being properly
applied, and an overlay file specific to Clearfog successfully masked
that error.

Change-Id: I7958b674b20616b594acc5f48a55cfcdd9809a75
Co-authored-by: Miroslav Mareš <mmares@cesnet.cz>
diff --git a/package/czechlight-rauc/system.conf.in b/package/czechlight-rauc/system.conf.in
index b2476eb..918f018 100644
--- a/package/czechlight-rauc/system.conf.in
+++ b/package/czechlight-rauc/system.conf.in
@@ -1,6 +1,6 @@
 [system]
-compatible=czechlight-epia-geode
-bootloader=CZECHLIGHT_RAUC_BOOTLOADER_NAME
+compatible=CZECHLIGHT_RAUC_COMPATIBLE
+bootloader=CZECHLIGHT_RAUC_BOOTLOADER
 
 [keyring]
 path=/etc/rauc/keyring.pem