Update DB{410,845}c to use 5.7 release branch

Now 5.7 is in rc7 stage but the release will be soon, and
the pre-release branch is complete comparing with 5.4.

Switch to have images based on 5.7 and make functional testing.

Signed-off-by: Aníbal Limón <anibal.limon@linaro.org>
Change-Id: I62b72a86a67abaf17f927bd7c71e563f73aa0edf
diff --git a/class/DB410C.var b/class/DB410C.var
index aacedf4..50dd294 100644
--- a/class/DB410C.var
+++ b/class/DB410C.var
@@ -1,3 +1,3 @@
-KVERS=5.4.0-qcomlt-arm64
+KVERS=5.7.0-qcomlt-arm64
 fdtfile=qcom/apq8016-sbc.dtb
 ROOTFS_PARTLABEL=rootfs
diff --git a/class/DB845C.var b/class/DB845C.var
index 80625d2..ade6118 100644
--- a/class/DB845C.var
+++ b/class/DB845C.var
@@ -1,3 +1,3 @@
-KVERS=5.4.0-qcomlt-arm64
+KVERS=5.7.0-qcomlt-arm64
 fdtfile=qcom/sdm845-db845c.dtb
 ROOTFS_PARTLABEL=rootfs
diff --git a/package_config/QCOM b/package_config/QCOM
index 866ebd1..02aa3bb 100644
--- a/package_config/QCOM
+++ b/package_config/QCOM
@@ -6,7 +6,7 @@
 PACKAGES install-norec DB410C
 firmware-qcom-dragonboard410c
 firmware-qcom-soc
-linux-image-5.4.0-qcomlt-arm64
+linux-image-5.7.0-qcomlt-arm64
 
 PACKAGES install-norec DB600C
 linux-image-4.14.0-qcomlt-arm
@@ -21,7 +21,7 @@
 firmware-atheros
 firmware-qcom-dragonboard845c
 firmware-qcom-soc
-linux-image-5.4.0-qcomlt-arm64
+linux-image-5.7.0-qcomlt-arm64
 network-manager-config-dragonboard845c
 pd-mapper
 tqftpserv