QCOM: fix kernel package name for DB820c

The build job was updated to append -arm or arm64 to the kernel image name, so
we were no picking the right kernel package anymore for DB820c.

Change-Id: I88d14110a7d60916303ecc05ff3a8afd6e77d85e
Signed-off-by: Nicolas Dechesne <nicolas.dechesne@linaro.org>
diff --git a/package_config/QCOM b/package_config/QCOM
index 28cbcff..7064cfa 100644
--- a/package_config/QCOM
+++ b/package_config/QCOM
@@ -8,7 +8,7 @@
 PACKAGES install-norec DB820C
 firmware-atheros
 firmware-qcom-dragonboard820c
-linux-image-4.11.0-qcomlt
+linux-image-4.11.0-qcomlt-arm64
 
 PACKAGES install-norec UBOOT
 u-boot-menu