qssi: Change the rollback index location

Rollback_index_location is same as of now for recovery and
system image which is giving compilation error for non A/B
builds.So changing the rollback index location of system.

Change-Id: I1f7e18dbbeedaef28e8dfccdf82c93e45d5fe1ea
diff --git a/qssi.mk b/qssi.mk
index c9296ca..365ac79 100644
--- a/qssi.mk
+++ b/qssi.mk
@@ -32,7 +32,7 @@
 BOARD_AVB_SYSTEM_KEY_PATH := external/avb/test/data/testkey_rsa2048.pem
 BOARD_AVB_SYSTEM_ALGORITHM := SHA256_RSA2048
 BOARD_AVB_SYSTEM_ROLLBACK_INDEX := 0
-BOARD_AVB_SYSTEM_ROLLBACK_INDEX_LOCATION := 1
+BOARD_AVB_SYSTEM_ROLLBACK_INDEX_LOCATION := 2
 
 TARGET_DEFINES_DALVIK_HEAP := true
 $(call inherit-product, device/qcom/qssi/common64.mk)