[SQUASH] stone: switch to libinit

switch to libinit for device recognition, taken and modified from

https://github.com/Evolution-X-Devices/device_xiaomi_marble/commits/udc/libinit

libinit/libinit_variant.cpp

@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2021 The LineageOS Project
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <android-base/logging.h>
+#include <android-base/properties.h>
+#include <libinit_utils.h>
+
+#include <libinit_variant.h>
+
+using android::base::GetProperty;
+
+#define HWC_PROP "ro.boot.hwc"
+#define SKU_PROP "ro.boot.product.hardware.sku"
+
+void search_variant(const std::vector<variant_info_t> variants) {
+    std::string hwc_value = GetProperty(HWC_PROP, "");
+    std::string sku_value = GetProperty(SKU_PROP, "");
+
+    for (const auto& variant : variants) {
+        if ((variant.hwc_value == "" || variant.hwc_value == hwc_value) &&
+            (variant.sku_value == "" || variant.sku_value == sku_value)) {
+            set_variant_props(variant);
+            break;
+        }
+    }
+}
+
+void set_variant_props(const variant_info_t variant) {
+    set_ro_build_prop("brand", variant.brand, true);
+    set_ro_build_prop("device", variant.device, true);
+    set_ro_build_prop("model", variant.model, true);
+    set_ro_build_prop("mod_device", variant.mod_device, true);
+    property_override("vendor.usb.product_string", variant.model, true);
+    if (access("/system/bin/recovery", F_OK) != 0) {
+        set_ro_build_prop("fingerprint", variant.build_fingerprint);
+        property_override("ro.bootimage.build.fingerprint", variant.build_fingerprint);
+        property_override("bluetooth.device.default_name", variant.model, true);
+        property_override("ro.build.description", fingerprint_to_description(variant.build_fingerprint));
+    }
+}