soapy: fix array parameter mismatch for some functions

With soapy 0.8.0, GCC 11.1.0 warns of mismatched array bounds
in some functions.
This commit aligns the bound and adds proper wrappers to
fix subsequent warnings.

lib/src/phy/rf/rf_soapy_imp.c

@@ -256,11 +256,15 @@ int rf_soapy_stop_tx_stream(void* h)
 void rf_soapy_flush_buffer(void* h)
 {
   int   n;
-  cf_t  tmp1[1024];
+  cf_t  dummy[1024];
-  cf_t  tmp2[1024];
+  void* data[SRSRAN_MAX_CHANNELS] = {};
-  void* data[2] = {tmp1, tmp2};
+
+  for (int i = 0; i < SRSRAN_MAX_CHANNELS; i++) {
+    data[i] = dummy;
+  }
+
   do {
-    n = rf_soapy_recv_with_time_multi(h, data, 1024, 0, NULL, NULL);
+    n = rf_soapy_recv_with_time_multi(h, data, sizeof(dummy), 0, NULL, NULL);
   } while (n > 0);
 }
 
@@ -848,7 +852,9 @@ int rf_soapy_recv_with_time_multi(void*    h,
 
 int rf_soapy_recv_with_time(void* h, void* data, uint32_t nsamples, bool blocking, time_t* secs, double* frac_secs)
 {
-  return rf_soapy_recv_with_time_multi(h, &data, nsamples, blocking, secs, frac_secs);
+  void* data_multi[SRSRAN_MAX_PORTS] = {NULL};
+  data_multi[0] = data;
+  return rf_soapy_recv_with_time_multi(h, data_multi, nsamples, blocking, secs, frac_secs);
 }
 
 int rf_soapy_send_timed(void*  h,

lib/src/phy/rf/rf_soapy_imp.h

@@ -14,6 +14,7 @@
 #define SRSRAN_RF_SOAPY_IMP_H_
 
 #include "srsran/config.h"
+#include "srsran/phy/common/phy_common.h"
 #include "srsran/phy/rf/rf.h"
 #include <stdbool.h>
 #include <stdint.h>
@@ -66,8 +67,12 @@ SRSRAN_API double rf_soapy_set_rx_freq(void* h, uint32_t ch, double freq);
 SRSRAN_API int
 rf_soapy_recv_with_time(void* h, void* data, uint32_t nsamples, bool blocking, time_t* secs, double* frac_secs);
 
-SRSRAN_API int
+SRSRAN_API int rf_soapy_recv_with_time_multi(void*    h,
-rf_soapy_recv_with_time_multi(void* h, void** data, uint32_t nsamples, bool blocking, time_t* secs, double* frac_secs);
+                                             void*    data[SRSRAN_MAX_PORTS],
+                                             uint32_t nsamples,
+                                             bool     blocking,
+                                             time_t*  secs,
+                                             double*  frac_secs);
 
 SRSRAN_API double rf_soapy_set_tx_srate(void* h, double freq);