FP2: Maintain armeabi-v7a prebuilts only

Drop unused and unmaintained prebuilt apk files. They are not getting
updated by upstream anymore and only waste space on the local checkout.

Issue: FP2P-461
Change-Id: I380234cb801d627f9d6954a8554e31589efce37c
diff --git a/Android.mk b/Android.mk
index 581462e..f4c3fea 100644
--- a/Android.mk
+++ b/Android.mk
@@ -1,5 +1,6 @@
 #
 # Copyright (C) 2014 The Android Open Source Project
+# Copyright 2020 Fairphone B.V.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -22,19 +23,15 @@
 
 LOCAL_MODULE := webview
 LOCAL_MODULE_CLASS := APPS
-LOCAL_MULTILIB := both
 LOCAL_CERTIFICATE := $(DEFAULT_SYSTEM_DEV_CERTIFICATE)
 LOCAL_REQUIRED_MODULES := \
         libwebviewchromium_loader \
         libwebviewchromium_plat_support
 
-LOCAL_MODULE_TARGET_ARCH := arm arm64 x86 x86_64
+LOCAL_MODULE_TARGET_ARCH := arm
 my_src_arch := $(call get-prebuilt-src-arch,$(LOCAL_MODULE_TARGET_ARCH))
 LOCAL_SRC_FILES := prebuilt/$(my_src_arch)/webview.apk
 
 LOCAL_PREBUILT_JNI_LIBS_arm := @lib/armeabi-v7a/libwebviewchromium.so
-LOCAL_PREBUILT_JNI_LIBS_arm64 := @lib/arm64-v8a/libwebviewchromium.so
-LOCAL_PREBUILT_JNI_LIBS_x86 := @lib/x86/libwebviewchromium.so
-LOCAL_PREBUILT_JNI_LIBS_x86_64 := @lib/x86_64/libwebviewchromium.so
 
 include $(BUILD_PREBUILT)
diff --git a/prebuilt/arm64/webview.apk b/prebuilt/arm64/webview.apk
deleted file mode 100644
index 2f85d3b..0000000
--- a/prebuilt/arm64/webview.apk
+++ /dev/null
Binary files differ
diff --git a/prebuilt/x86/webview.apk b/prebuilt/x86/webview.apk
deleted file mode 100644
index 387d767..0000000
--- a/prebuilt/x86/webview.apk
+++ /dev/null
Binary files differ
diff --git a/prebuilt/x86_64/webview.apk b/prebuilt/x86_64/webview.apk
deleted file mode 100644
index bc95241..0000000
--- a/prebuilt/x86_64/webview.apk
+++ /dev/null
Binary files differ