Add magisk daemon

jni/daemon/daemon.h

@@ -0,0 +1,10 @@
+/* daemon.h - Utility functions for daemon-client communication
+ */
+
+// socket_trans.c
+int recv_fd(int sockfd);
+void send_fd(int sockfd, int fd);
+int read_int(int fd);
+void write_int(int fd, int val);
+char* read_string(int fd);
+void write_string(int fd, const char* val);