dragonboard845c: switch default rootfs on /dev/sda1, e.g. 'rootfs'

New bootloader package is now available from Linaro, and the default
ptable is to leave /dev/sda (e.g. LUN0 or HLOS LUN) with a single
partition that occupies the entire space. The default name for this
partition is 'rootfs'.

Change-Id: Ia7c7be58a0b169e4aff14d4e2aa33e0d21897682
Signed-off-by: Nicolas Dechesne <nicolas.dechesne@linaro.org>
diff --git a/class/DB845C.var b/class/DB845C.var
index ce313f6..22e55f0 100644
--- a/class/DB845C.var
+++ b/class/DB845C.var
@@ -1,3 +1,3 @@
 KVERS=5.1.0-qcomlt-arm64
 fdtfile=qcom/sdm845-db845c.dtb
-ROOTFS_PARTLABEL=userdata
+ROOTFS_PARTLABEL=rootfs