Revert "Enable building of Gnss Hidl 2.1"

Temp Revert "Enable building of Gnss Hidl 2.1" to go
back to Gnss Hidl 2.0 until the compatibility matrix
change for Gnss Hidl 2.1 is ready on system side

Change-Id: I5d14bd5bd75567c63cc6a9830db38af3d9e4393e
CRs-fixed: 2680552
diff --git a/Android.mk b/Android.mk
index 5c936ae..2b0b9e5 100644
--- a/Android.mk
+++ b/Android.mk
@@ -18,7 +18,7 @@
     -Wno-error=switch \
     -Wno-error=date-time
 
-GNSS_HIDL_VERSION = 2.1
+GNSS_HIDL_VERSION = 2.0
 
 GNSS_HIDL_LEGACY_MEASURMENTS_TARGET_LIST += msm8937
 GNSS_HIDL_LEGACY_MEASURMENTS_TARGET_LIST += msm8953