libavcenc: model CBR-NLDRC as CBR mode with out frame drops

In frame drop mode, the stream generated is non-compliant.
For now disable frame drop mode.

encoder/ih264e_rate_control.c

@@ -595,8 +595,8 @@ WORD32 ih264e_rc_post_enc(void * ps_rate_control_api,
     /* Set post encode skip to zero */
     pi4_is_post_encode_skip[0]= 0;
 
-    /* For NLDRC, get the buffer status for stuffing or skipping */
-    if (irc_get_rc_type(ps_rate_control_api) == CBR_NLDRC)
+    /* For CBR with frame drops enable the below section. By default CBR_NLDRC is CBR with no frame drops */
+    if (0 && irc_get_rc_type(ps_rate_control_api) == CBR_NLDRC)
     {
         WORD32 i4_get_num_bit_to_prevent_vbv_overflow;
         UWORD8 u1_enc_buf_overflow,u1_enc_buf_underflow;