[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/arch-common/bionic/crtbrand.S b/libc/arch-common/bionic/crtbrand.S
index 307ef2e..b7540e9 100644
--- a/libc/arch-common/bionic/crtbrand.S
+++ b/libc/arch-common/bionic/crtbrand.S
@@ -40,7 +40,7 @@
 abitag:
   .long 2f-1f                 // int32_t namesz
   .long 3f-2f                 // int32_t descsz
-  .long NT_TYPE_IDENT         // int32_t type
+  .long NT_ANDROID_TYPE_IDENT // int32_t type
 #ifdef __ANDROID__
 1:.ascii "Android\0"          // char name[]
 2:.long PLATFORM_SDK_VERSION  // int32_t android_api