llext: export symbols, needed by TDFB

Modular TDFB needs additional exported symbols from Zephyr and SOF
core.

Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>

Author: lyakh

src/ipc/ipc-common.c

@@ -247,6 +247,7 @@ void ipc_msg_send(struct ipc_msg *msg, void *data, bool high_priority)
 
 	k_spin_unlock(&ipc->lock, key);
 }
+EXPORT_SYMBOL(ipc_msg_send);
 
 #ifdef __ZEPHYR__
 static void ipc_work_handler(struct k_work *work)

src/math/sqrt_int16.c

@@ -6,6 +6,7 @@
 //
 //
 
+#include <rtos/symbol.h>
 #include <sof/math/sqrt.h>
 
 #define SQRT_WRAP_SCHAR_BITS 0xFF
@@ -145,3 +146,4 @@ uint16_t sqrt_int16(uint16_t u)
 
 	return y;
 }
+EXPORT_SYMBOL(sqrt_int16);

src/math/trig.c

@@ -7,6 +7,7 @@
 //         Keyon Jie <yang.jie@linux.intel.com>
 //         Shriram Shastry <malladi.sastry@linux.intel.com>
 
+#include <rtos/symbol.h>
 #include <sof/audio/format.h>
 #include <sof/math/trig.h>
 #include <sof/math/cordic.h>
@@ -99,6 +100,7 @@ void cordic_approx(int32_t th_rad_fxp, int32_t a_idx, int32_t *sign, int32_t *b_
 	/* Q2.30 format -sine, cosine*/
 	*th_cdc_fxp = th_rad_fxp;
 }
+EXPORT_SYMBOL(cordic_approx);
 
 /**
  * CORDIC-based approximation for inverse cosine