Revert "Make bionic_platform_headers available only for Bionic t..."

Reason for revert: Breaks rvc-d1-dev-plus-aosp: http://ab/6443190
Reverted Changes:
Ide447b89a:bionic_libc_platform_headers is only available whe...
Ia93cd3ec8:bionic_libc_platform_headers is only available whe...
Icdc495588:Make bionic_platform_headers available only for Bi...
Idfd7c87dc:bionic_libc_platform_headers is only available whe...

Bug: 152255951
Bug: 155269399
Change-Id: I214f1165bb0a7e59d3b35a13b3cceb1965be922b
diff --git a/libc/Android.bp b/libc/Android.bp
index b2ba2c3..f73ae4a 100644
--- a/libc/Android.bp
+++ b/libc/Android.bp
@@ -1751,7 +1751,6 @@
 // Headers that only other parts of the platform can include.
 cc_library_headers {
     name: "bionic_libc_platform_headers",
-    defaults: ["linux_bionic_supported"],
     visibility: [
         "//art:__subpackages__",
         "//bionic:__subpackages__",
@@ -1763,6 +1762,7 @@
         "//system/core/libunwindstack:__subpackages__",
         "//system/memory/libmemunreachable:__subpackages__",
     ],
+    host_supported: true,
     vendor_available: true,
     ramdisk_available: true,
     recovery_available: true,