Remove NDK exports

Base headers should come from sysroot.

Bug: N/A
Test: build
Change-Id: I9537581eaddd83f5fffcc4e1ef1d30cef908e3c6

Author: smore-lore

libc/Android.bp

@@ -2330,17 +2330,6 @@ ndk_library {
     name: "libc",
     symbol_file: "libc.map.txt",
     first_version: "9",
-    export_header_libs: [
-        "common_libc",
-        "libc_uapi",
-        "libc_kernel_android_uapi_linux",
-        "libc_kernel_android_scsi",
-        "libc_asm_arm",
-        "libc_asm_arm64",
-        "libc_asm_riscv64",
-        "libc_asm_x86",
-        "libc_asm_x86_64",
-    ],
 }
 
 ndk_library {