sm7250-common: rootdir: tune zram performance

-Set zram disksize so it can successfully initialize
-Set max_comp_streams to num of cores since upstream also moves this to percpu.
-Switch to LZ4 for better overall performance
-Set page-cluster to 0 as the incremental cost of reading 1 page at a time is negligible for zram

Bug: 38249616
Test: boot and run zram-perf showing better performance
Signed-off-by: aswin7469 <aswinas@pixysos.com>

rootdir/etc/init.target.rc

@@ -48,6 +48,10 @@ on init
     start vendor.qseecomd
     start keymaster-4-0
 
+    # ZRAM setup
+    write /sys/block/zram0/comp_algorithm lz4
+    write /proc/sys/vm/page-cluster 0
+
 on early-fs
     start vold
 
@@ -113,6 +117,11 @@ on charger
     setprop vendor.usb.controller a600000.dwc3
     setprop sys.usb.configfs 1
 
+on property:sys.boot_completed=1
+    # Enable ZRAM on boot_complete
+    swapon_all /vendor/etc/fstab.qcom
+    write /proc/sys/vm/swappiness 100
+
 #pd-mapper
 service vendor.pd_mapper /vendor/bin/pd-mapper
     class core