android: keep only xposed flavor

also changed Build.ID check to startsWith("CP1A")

android/app/src/main/cpp/l2c_fcr_hook.h

@@ -0,0 +1,52 @@
+/*
+    LibrePods - AirPods liberated from Apple’s ecosystem
+    Copyright (C) 2025 LibrePods contributors
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+#include <cstdint>
+
+typedef int (*HookFunType)(void *func, void *replace, void **backup);
+
+typedef void (*NativeOnModuleLoaded)(const char *name, void *handle);
+
+typedef struct {
+    uint32_t version;
+    void* hook_func;
+    void* unhook_func;
+} NativeAPIEntries;
+
+typedef NativeOnModuleLoaded (*NativeInit)(const NativeAPIEntries *entries);
+
+typedef enum : uint8_t {
+    BTA_SUCCESS = 0, /* Successful operation. */
+    BTA_FAILURE = 1, /* Generic failure. */
+    BTA_PENDING = 2, /* API cannot be completed right now */
+    BTA_BUSY = 3,
+    BTA_NO_RESOURCES = 4,
+    BTA_WRONG_MODE = 5,
+} tBTA_STATUS;
+
+typedef struct t_sdp_di_record {
+    uint16_t vendor;
+    uint16_t vendor_id_source;
+    uint16_t product;
+    uint16_t version;
+    bool primary_record;
+    char client_executable_url[400];
+    char service_description[400];
+    char documentation_url[400];
+} tSDP_DI_RECORD;