manifest: android-8.0.0_r30 -> android-8.1.0_r1 & lineage-15.0 -> lineage-15.1

Also switch to AOSP's versions of the following repos
 - external/libnetfilter_conntrack
 - external/libnfnetlink
 - system/hardware/interfaces
 - system/netd

Change-Id: I46fb1ef95cef62cc7f5f1600c3e578660f034e12
diff --git a/snippets/lineage.xml b/snippets/lineage.xml
index eefb9c5..54bccf0 100644
--- a/snippets/lineage.xml
+++ b/snippets/lineage.xml
@@ -79,7 +79,7 @@
   <project path="hardware/qcom/audio-caf/msm8960" name="LineageOS/android_hardware_qcom_audio" groups="qcom,qcom_audio,pdk" revision="lineage-15.0-caf-8960" />
   <project path="hardware/qcom/audio-caf/msm8974" name="LineageOS/android_hardware_qcom_audio" groups="qcom,qcom_audio,pdk" revision="lineage-15.0-caf-8974" />
   <project path="hardware/qcom/audio-caf/msm8994" name="LineageOS/android_hardware_qcom_audio" groups="qcom,qcom_audio,pdk" revision="lineage-15.0-caf-8994" />
-  <project path="hardware/qcom/audio-caf/msm8996" name="LineageOS/android_hardware_qcom_audio" groups="qcom,qcom_audio,pdk" revision="lineage-15.0-caf-8996" />
+  <project path="hardware/qcom/audio-caf/msm8996" name="LineageOS/android_hardware_qcom_audio" groups="qcom,qcom_audio,pdk" revision="staging/lineage-15.1-caf-8996" />
   <project path="hardware/qcom/audio-caf/msm8998" name="LineageOS/android_hardware_qcom_audio" groups="qcom,qcom_audio,pdk" revision="lineage-15.0-caf-8998" />
   <project path="hardware/qcom/bt-caf" name="LineageOS/android_hardware_qcom_bt" groups="qcom,pdk" revision="lineage-15.0-caf" />
   <project path="hardware/qcom/display-caf/apq8084" name="LineageOS/android_hardware_qcom_display" groups="pdk,qcom,qcom_display" revision="lineage-15.0-caf-8084" />
@@ -89,7 +89,7 @@
   <project path="hardware/qcom/display-caf/msm8960" name="LineageOS/android_hardware_qcom_display" groups="pdk,qcom,qcom_display" revision="lineage-15.0-caf-8960" />
   <project path="hardware/qcom/display-caf/msm8974" name="LineageOS/android_hardware_qcom_display" groups="pdk,qcom,qcom_display" revision="lineage-15.0-caf-8974" />
   <project path="hardware/qcom/display-caf/msm8994" name="LineageOS/android_hardware_qcom_display" groups="pdk,qcom,qcom_display" revision="lineage-15.0-caf-8994" />
-  <project path="hardware/qcom/display-caf/msm8996" name="LineageOS/android_hardware_qcom_display" groups="pdk,qcom,qcom_display" revision="lineage-15.0-caf-8996" />
+  <project path="hardware/qcom/display-caf/msm8996" name="LineageOS/android_hardware_qcom_display" groups="pdk,qcom,qcom_display" revision="staging/lineage-15.1-caf-8996" />
   <project path="hardware/qcom/display-caf/msm8998" name="LineageOS/android_hardware_qcom_display" groups="pdk,qcom,qcom_display" revision="lineage-15.0-caf-8998" />
   <project path="hardware/qcom/fm" name="LineageOS/android_hardware_qcom_fm" groups="qcom,qcom_fm" />
   <project path="hardware/qcom/media-caf/apq8084" name="LineageOS/android_hardware_qcom_media" groups="qcom,pdk" revision="lineage-15.0-caf-8084" />