[rrlp] Fix compiler warnings
The apdu is static const u_int8_t. Change the signature to
have a const in there to make the compiler happy, include
chan_alloc.h for lchan methods.
diff --git a/openbsc/src/rrlp.c b/openbsc/src/rrlp.c
index 61bb202..523b53f 100644
--- a/openbsc/src/rrlp.c
+++ b/openbsc/src/rrlp.c
@@ -26,6 +26,7 @@
#include <openbsc/gsm_04_08.h>
#include <openbsc/signal.h>
#include <openbsc/gsm_subscriber.h>
+#include <openbsc/chan_alloc.h>
/* RRLP MS based position request */
static const u_int8_t ms_based_pos_req[] = { 0x40, 0x01, 0x78, 0xa8 };