adb: Cleanup dead code

dns_service is unused and recover_service has been replaced by adb
sideload

Change-Id: Ie90000d7f672e8299ee1622a9690c7371b214dc1
diff --git a/adb/Android.mk b/adb/Android.mk
index a803978..36f595b 100644
--- a/adb/Android.mk
+++ b/adb/Android.mk
@@ -64,7 +64,6 @@
 	file_sync_client.c \
 	$(EXTRA_SRCS) \
 	$(USB_SRCS) \
-	utils.c \
 	usb_vendors.c
 
 LOCAL_C_INCLUDES += external/openssl/include
@@ -116,8 +115,7 @@
 	framebuffer_service.c \
 	remount_service.c \
 	usb_linux_client.c \
-	log_service.c \
-	utils.c
+	log_service.c
 
 LOCAL_CFLAGS := -O2 -g -DADB_HOST=0 -Wall -Wno-unused-parameter
 LOCAL_CFLAGS += -D_XOPEN_SOURCE -D_GNU_SOURCE
@@ -157,7 +155,6 @@
 	file_sync_client.c \
 	get_my_path_linux.c \
 	usb_linux.c \
-	utils.c \
 	usb_vendors.c \
 	fdevent.c