Remove zram cold page writeback file

Bug: 140879284
Test: boot
Change-Id: I6914b215f0e85e3b4419c90c1f17869cfd2eeb59
(cherry picked from commit 599318c66ead4389d014800fcdc624412c110d44)
diff --git a/init.hardware.rc b/init.hardware.rc
index 2684a7a..f6643df 100644
--- a/init.hardware.rc
+++ b/init.hardware.rc
@@ -599,6 +599,7 @@
     write /sys/devices/platform/soc/${ro.boot.bootdevice}/hibern8_on_idle_enable 1
 
     # Enable ZRAM on boot_complete
+    rm /data/unencrypted/zram_swap
     swapon_all /vendor/etc/fstab.${ro.boot.hardware.platform}
     write /proc/sys/vm/swappiness 100