Mark e2fs libs vendor_available.

libext2_blkid, libext2_com_err, libext2_e2p, libext2_uuid are libraries which
belong to vndk-cap. Mark them vendor_available to enable vndk abi stability
checks on them.

Details: https://android-review.googlesource.com/368372

Test: mm -j64

Bug: 38244611

Change-Id: I1931063b88b845a9a9d06188555c34f1fbc3e369
diff --git a/lib/blkid/Android.bp b/lib/blkid/Android.bp
index 9b385f9..5ad2842 100644
--- a/lib/blkid/Android.bp
+++ b/lib/blkid/Android.bp
@@ -2,6 +2,7 @@
 
 cc_library {
     name: "libext2_blkid",
+    vendor_available: true,
     host_supported: true,
     unique_host_soname: true,
     srcs: [
diff --git a/lib/e2p/Android.bp b/lib/e2p/Android.bp
index db51670..c6f3779 100644
--- a/lib/e2p/Android.bp
+++ b/lib/e2p/Android.bp
@@ -2,6 +2,7 @@
 
 cc_library {
     name: "libext2_e2p",
+    vendor_available: true,
     host_supported: true,
     unique_host_soname: true,
     srcs: [
diff --git a/lib/et/Android.bp b/lib/et/Android.bp
index f6ad416..c9098c3 100644
--- a/lib/et/Android.bp
+++ b/lib/et/Android.bp
@@ -2,6 +2,7 @@
 
 cc_library {
     name: "libext2_com_err",
+    vendor_available: true,
     host_supported: true,
     unique_host_soname: true,
     srcs: [
diff --git a/lib/uuid/Android.bp b/lib/uuid/Android.bp
index d173788..7ea7ff0 100644
--- a/lib/uuid/Android.bp
+++ b/lib/uuid/Android.bp
@@ -2,6 +2,7 @@
 
 cc_library {
     name: "libext2_uuid",
+    vendor_available: true,
     host_supported: true,
     unique_host_soname: true,
     srcs: [