Remove libbinder_headers from apex_available allowlist

libbinder_headers now sets apex_available property.

Bug: 150999716
Test: m
Change-Id: If58cfeafcc13fc36be8e44a66f2f472460fd4c8d
diff --git a/apex/apex.go b/apex/apex.go
index c897042..062957c 100644
--- a/apex/apex.go
+++ b/apex/apex.go
@@ -2346,7 +2346,6 @@
 		"libFraunhoferAAC",
 		"libaudio-a2dp-hw-utils",
 		"libaudio-hearing-aid-hw-utils",
-		"libbinder_headers",
 		"libbluetooth",
 		"libbluetooth-types",
 		"libbluetooth-types-header",
@@ -2477,7 +2476,6 @@
 		"libaudiopolicy",
 		"libaudioutils",
 		"libaudioutils_fixedfft",
-		"libbinder_headers",
 		"libbluetooth-types-header",
 		"libbufferhub",
 		"libbufferhub_headers",
@@ -2593,7 +2591,6 @@
 		"libavcenc",
 		"libavservices_minijail",
 		"libavservices_minijail",
-		"libbinder_headers",
 		"libbinderthreadstateutils",
 		"libbluetooth-types-header",
 		"libbufferhub_headers",