MT#56008 fix G.722 ptime/multiplier confusion

G.722 uses 4 bits per sample, not 8. This error was negated by the ptime
incorrectly being adjusted by the clock rate multiplier.

Change-Id: I125c897ee9cbdac29278be9b6451d82b48ff94c2
(cherry picked from commit e7b9ab2825)

lib/codeclib.c

@@ -211,7 +211,7 @@ static codec_def_t __codec_defs[] = {
 		.default_channels = 1,
 		.default_ptime = 20,
 		.packetizer = packetizer_samplestream,
-		.bits_per_sample = 8,
+		.bits_per_sample = 4,
 		.media_type = MT_AUDIO,
 		.codec_type = &codec_type_avcodec,
 		.silence_pattern = STR_CONST_INIT("\xfa"),
@@ -1331,7 +1331,7 @@ int encoder_config_fmtp(encoder_t *enc, const codec_def_t *def, int bitrate, int
 
 	enc->requested_format = *requested_format;
 	enc->def = def;
-	enc->ptime = ptime / def->clockrate_mult;
+	enc->ptime = ptime;
 	enc->bitrate = bitrate;
 
 	err = def->codec_type->encoder_init ? def->codec_type->encoder_init(enc, fmtp, extra_opts) : 0;