adjust and move zram write back policy to common

Bug: 166739872
Test: boot
Signed-off-by: Martin Liu <liumartin@google.com>
Change-Id: I60bfc1b2a43b365412acba1fdd816842969a5eb6
diff --git a/device.mk b/device.mk
index e534b0b..16d54de 100644
--- a/device.mk
+++ b/device.mk
@@ -325,9 +325,6 @@
     persist.rcs.supported=1 \
     vendor.rild.libpath=/vendor/lib64/libril-qc-hal-qmi.so \
     ro.hardware.keystore_desede=true \
-    ro.zram.mark_idle_delay_mins=60 \
-    ro.zram.first_wb_delay_mins=180 \
-    ro.zram.periodic_wb_delay_hours=24 \
 
 # Enable reboot free DSDS
 PRODUCT_PRODUCT_PROPERTIES += \