dlkm_loader: Enable vendor_dlkm partition support

Enable vendor_dlkm partition support on DB845c target build.
It will help us load kernel modules from vendor_dlkm
partition using dlkm_loader service at boot time.

Also changed system_dlkm partition from ext4 to erofs to
maintain consistency across all the "read-only" partitions.

Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Change-Id: I761e256f7ac630048ceacb7034c02f943553728d
diff --git a/shared/utils/dlkm_loader/device.mk b/shared/utils/dlkm_loader/device.mk
index c1ba32e..57b951f 100644
--- a/shared/utils/dlkm_loader/device.mk
+++ b/shared/utils/dlkm_loader/device.mk
@@ -1,4 +1,4 @@
-AB_OTA_PARTITIONS += system_dlkm
+AB_OTA_PARTITIONS += system_dlkm vendor_dlkm
 PRODUCT_PACKAGES += dlkm_loader
 
 # List of modules that should not load automatically