Add emulator-arm to SDK, including Windows SDK.

Also fixes the fact the Windows SDK wasn't building emulator-arm
nor emulator-x86.

SDK BUG: 4377649

Change-Id: I1450a8c73e0078e69ccd28b220bf37ecd0a6fd5c
diff --git a/build/tools.atree b/build/tools.atree
index 89481fc..2e566e6 100644
--- a/build/tools.atree
+++ b/build/tools.atree
@@ -40,11 +40,12 @@
 bin/zipalign     tools/zipalign
 
 # emulator
-bin/emulator tools/emulator-arm
-bin/emulator-x86   tools/emulator-x86
-sdk/emulator/snapshot/snapshots.img tools/lib/emulator/snapshots.img
-usr/share/pc-bios/bios.bin   tools/lib/pc-bios/bios.bin
-usr/share/pc-bios/vgabios-cirrus.bin   tools/lib/pc-bios/vgabios-cirrus.bin
+bin/emulator                         tools/emulator
+bin/emulator-x86                     tools/emulator-x86
+bin/emulator-arm                     tools/emulator-arm
+sdk/emulator/snapshot/snapshots.img  tools/lib/emulator/snapshots.img
+usr/share/pc-bios/bios.bin           tools/lib/pc-bios/bios.bin
+usr/share/pc-bios/vgabios-cirrus.bin tools/lib/pc-bios/vgabios-cirrus.bin
 
 # Java-Based SDK Tools
 bin/ddms            tools/ddms