[NFCI] Change Android's NT_TYPE to NT_ANDROID_TYPE.

Normally, platform-specific note types in the toolchain are prefixed
with the platform name. Because we're exposing the NT_TYPE_MEMTAG and
synthesizing the note in the toolchain in an upcoming patch
(https://reviews.llvm.org/D118948), it's been requested that we change
the name to include the platform prefix.

While NT_TYPE_IDENT and NT_TYPE_KUSER aren't known about or synthesized
by the toolchain, update those references as well for consistency.

Bug: N/A
Test: Build Android
Change-Id: I7742e4917ae275d59d7984991664ea48028053a1
diff --git a/libc/bionic/libc_init_static.cpp b/libc/bionic/libc_init_static.cpp
index 67e692c..ef2e56a 100644
--- a/libc/bionic/libc_init_static.cpp
+++ b/libc/bionic/libc_init_static.cpp
@@ -194,7 +194,7 @@
   if (note->n_namesz != 8 || strncmp(name, "Android", 8) != 0) {
     return false;
   }
-  if (note->n_type != NT_TYPE_MEMTAG) {
+  if (note->n_type != NT_ANDROID_TYPE_MEMTAG) {
     return false;
   }
   if (note->n_descsz != 4) {