Revert "Demodulator sets LLR to zero for 0.0 symbols"

This reverts commit 1a6e5cdee5.

lib/src/phy/modem/demod_soft.c

@@ -928,15 +928,5 @@ int srsran_demod_soft_demodulate_b(srsran_mod_t modulation, const cf_t* symbols,
       ERROR("Invalid modulation %d", modulation);
       return -1;
   }
-
-  uint32_t nof_bits_x_symbol = srsran_mod_bits_x_symbol(modulation);
-  for (uint32_t i = 0; i < nsymbols; i++) {
-    if (!isnormal(__real__ symbols[i]) || !isnormal(__imag__ symbols[i])) {
-      for (uint32_t j = 0; j < nof_bits_x_symbol; j++) {
-        llr[i * nof_bits_x_symbol + j] = 0;
-      }
-    }
-  }
-
   return 0;
 }