laurel_sprout: tune zram performance

-Set max_comp_streams to num of cores since upstream also moves this to
percpu.

Bug: 38249616
Test: boot and run zram-perf showing better performance

Change-Id: I0b92b246d773db85aa03d033b2cecee54347cbd1
diff --git a/rootdir/etc/fstab.qcom b/rootdir/etc/fstab.qcom
index 67626ac..6b67206 100644
--- a/rootdir/etc/fstab.qcom
+++ b/rootdir/etc/fstab.qcom
@@ -47,4 +47,4 @@
 # The update_engine code looks for this entry in order to determine the boot device address
 # and fails if it does not find it.
 /dev/block/bootdevice/by-name/misc                      /misc              emmc    defaults                                             defaults
-/dev/block/zram0                                        none               swap    defaults                                             zramsize=1073741824
+/dev/block/zram0                                        none               swap    defaults                                             zramsize=1073741824,max_comp_streams=8