feat: add RTL-SDR, R820t drivers, radio APIs, and sdr demo tool

programs/include/libc/montauk.h

@@ -163,6 +163,15 @@ extern "C" {
 #define MTK_SYS_BTSETADDR          137
 #define MTK_SYS_BTBONDS            138
 #define MTK_SYS_BTFORGET           139
+#define MTK_SYS_SDR_COUNT          140
+#define MTK_SYS_SDR_INFO           141
+#define MTK_SYS_SDR_OPEN           142
+#define MTK_SYS_SDR_CLOSE          143
+#define MTK_SYS_SDR_START          144
+#define MTK_SYS_SDR_STOP           145
+#define MTK_SYS_SDR_READ           146
+#define MTK_SYS_SDR_SETPARAM       147
+#define MTK_SYS_SDR_GETPARAM       148
 /* @SYSCALLS-END */
 
 #define MTK_SOCK_TCP 1