Split adb_main.cpp into client and daemon.

The name "client" is somewhat misleading as it also contains the host
side adb server, but it's a part of the client binary.

Change-Id: I128b7bab213e330eb21b5010cd1fec5f7a62c8af
diff --git a/adb/Android.mk b/adb/Android.mk
index 1aed2cb..4ffb589 100644
--- a/adb/Android.mk
+++ b/adb/Android.mk
@@ -175,7 +175,7 @@
 LOCAL_CLANG := $(adb_host_clang)
 
 LOCAL_SRC_FILES := \
-    adb_main.cpp \
+    client/main.cpp \
     console.cpp \
     commandline.cpp \
     adb_client.cpp \
@@ -227,7 +227,7 @@
 LOCAL_CLANG := true
 
 LOCAL_SRC_FILES := \
-    adb_main.cpp \
+    daemon/main.cpp \
     services.cpp \
     file_sync_service.cpp \
     framebuffer_service.cpp \