Revert^2 "Expose AID_KEYSTORE"

Revert submission revert-1660531-max-boot-level-crypto-KFMCEDKSIV

Reason for revert: topic:vold-use-keystore2 has landed fixing the bug

Reverted changes:
Ibf63734a: Revert "Set earlyBootEnded before apex starts"
Id02f63a7: Revert "Expose AID_KEYSTORE"
Ibcedeff4: Revert "Cryptographic security for MAX_BOOT_LEVEL"

Restored changes:
Ia3b968afc:Set earlyBootEnded before apex starts
Ia69891291:Expose AID_KEYSTORE
I12530cd13:Cryptographic security for MAX_BOOT_LEVEL

Reverted-SHA1: a801eabe11ecdfe18b327f67d3b53bfb517551a4

Original commit message:
Keystore uses this as the user ID for keys that it creates for its
own use.

Bug: 176450483
Test: atest com.android.tests.odsign.OnDeviceSigningHostTest#verifyArtUpgradeSignsFiles
Change-Id: I0e2baa8807281ec9e5cc0a9ff8daff191285a600
diff --git a/libcutils/Android.bp b/libcutils/Android.bp
index 0f3763c..a99cae2 100644
--- a/libcutils/Android.bp
+++ b/libcutils/Android.bp
@@ -363,8 +363,9 @@
     local_include_dirs: ["include"],
     bindgen_flags: [
         "--whitelist-function", "multiuser_get_app_id",
-        "--whitelist-function", "multiuser_get_user_id",
         "--whitelist-function", "multiuser_get_uid",
+        "--whitelist-function", "multiuser_get_user_id",
+        "--whitelist-var", "AID_KEYSTORE",
         "--whitelist-var", "AID_USER_OFFSET",
     ],
 }