init.mmi.rc: enable zram on boot_complete

This help to save ~50ms in boot time and bootanim shown time

Bug: 62957152
Test: marlin boot and swap look normal after boot
Change-Id: Icabec31aa677bd606ca8735fe9d2acb54e88bd75

rootdir/etc/init.mmi.rc

@@ -65,7 +65,6 @@ on post-fs
     chmod 0711 /persist/rfs/msm/mpss
     chmod 0771 /persist/rfs/msm/mpss/mot_rfs
 
-    swapon_all fstab.qcom
     write /proc/sys/vm/page-cluster 0
 
 on post-fs-data
@@ -305,3 +304,7 @@ on property:sys.wifi.tethering=false
 
 on property:ro.bootmode=normal
    write /sys/module/usb3813_hub/parameters/boost_val 3
+
+on property:sys.boot_completed=1
+    # Enable ZRAM on boot_complete
+    swapon_all fstab.qcom