Fastbootd: fixed missing file in Android.mk

Change-Id: I10927f488e35c688483f2d1d8c9f5b7ea1d7912d
diff --git a/fastbootd/Android.mk b/fastbootd/Android.mk
index 148d9fd..f7c67a9 100644
--- a/fastbootd/Android.mk
+++ b/fastbootd/Android.mk
@@ -27,6 +27,7 @@
     commands/boot.c \
     commands/flash.c \
     commands/partitions.c \
+    commands/virtual_partitions.c \
     fastbootd.c \
     protocol.c \
     transport.c \