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/czechlight-rauc.mk b/package/czechlight-rauc/czechlight-rauc.mk
index f0ac674..300379f 100644
--- a/package/czechlight-rauc/czechlight-rauc.mk
+++ b/package/czechlight-rauc/czechlight-rauc.mk
@@ -62,7 +62,7 @@
 define CZECHLIGHT_RAUC_INSTALL_TARGET_CMDS
 	$(INSTALL) -D -m 0644 $(BR2_EXTERNAL_CZECHLIGHT_PATH)/crypto/rauc-cert.pem $(TARGET_DIR)/etc/rauc/keyring.pem
 	$(INSTALL) -D -m 0644 $(BR2_EXTERNAL_CZECHLIGHT_PATH)/package/czechlight-rauc/system.conf.in $(TARGET_DIR)/etc/rauc/system.conf
-	sed -i -E -e "s|CZECHLIGHT_RAUC_BOOTLOADER|$(CZECHLIGHT_RAUC_BOOTLOADER)|" \
+	sed -i -E -e "s|CZECHLIGHT_RAUC_BOOTLOADER|$(call qstrip, $(CZECHLIGHT_RAUC_BOOTLOADER))|" \
 		-e 's|CZECHLIGHT_RAUC_COMPATIBLE|$(call qstrip,$(CZECHLIGHT_RAUC_COMPATIBLE))|' \
 		-e "s|CZECHLIGHT_RAUC_SLOT_A_ROOTFS_DEV|$(call qstrip,$(CZECHLIGHT_RAUC_SLOT_A_ROOTFS_DEV))|" \
 		-e "s|CZECHLIGHT_RAUC_SLOT_A_CFG_DEV|$(call qstrip,$(CZECHLIGHT_RAUC_SLOT_A_CFG_DEV))|" \