toolchain: Switch back to tracked revisions on Android

This allows us to recreate the entire LVL package from any point in history.
We continue to pull known good revisions from AOSP.
diff --git a/build-android/glslang_revision_android b/build-android/glslang_revision_android
index 1f7391f..a81a930 100644
--- a/build-android/glslang_revision_android
+++ b/build-android/glslang_revision_android
@@ -1 +1 @@
-master
+7fb605aeb525728edc23aaf3d3fd0ce08a6df95b
diff --git a/build-android/shaderc_revision_android b/build-android/shaderc_revision_android
index 1f7391f..12319e1 100644
--- a/build-android/shaderc_revision_android
+++ b/build-android/shaderc_revision_android
@@ -1 +1 @@
-master
+d65b38bd6b95dea19e02814eb776dd1738aae0da
diff --git a/build-android/spirv-headers_revision_android b/build-android/spirv-headers_revision_android
index 1f7391f..d3fb69e 100644
--- a/build-android/spirv-headers_revision_android
+++ b/build-android/spirv-headers_revision_android
@@ -1 +1 @@
-master
+e9f7d8ac3cda59f2637776eea1dfad0e171fba21
diff --git a/build-android/spirv-tools_revision_android b/build-android/spirv-tools_revision_android
index 1f7391f..0fedfe9 100644
--- a/build-android/spirv-tools_revision_android
+++ b/build-android/spirv-tools_revision_android
@@ -1 +1 @@
-master
+1401a61b1e7d1516578171a94edbac33858fb1a2