Split *_product makefiles

So far, we have *_system.mk and *_vendor.mk.
This patch split all product settings from *_vendor.mk to new
*_product.mk

This patch also create a new telephony.mk to include all
telephony_*.mk

Bug: 119747870
Test: lunch mainline_arm64-user; make -j
Test: compare the content with and without the patch
Test: the output files in out folder are the same
Change-Id: I79aefdd1971b3b5724a3ec858de4109b645c765a
Merged-In: I79aefdd1971b3b5724a3ec858de4109b645c765a

target/product/handheld_product.mk

@@ -0,0 +1,43 @@
+#
+# Copyright (C) 2019 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# This makefile contains the product partition contents for
+# a generic phone or tablet device. Only add something here if
+# it definitely doesn't belong on other types of devices (if it
+# does, use base_vendor.mk).
+$(call inherit-product, $(SRC_TARGET_DIR)/product/media_product.mk)
+
+# /product packages
+PRODUCT_PACKAGES += \
+    Browser2 \
+    Calendar \
+    Camera2 \
+    Contacts \
+    DeskClock \
+    Email \
+    Gallery2 \
+    LatinIME \
+    Launcher3QuickStep \
+    Music \
+    OneTimeInitializer \
+    PrintRecommendationService \
+    Provision \
+    QuickSearchBox \
+    Settings \
+    SettingsIntelligence \
+    StorageManager \
+    SystemUI \
+    WallpaperCropper \