IOC Mediator: fix multi-signal parsing issue

The patch resolves a bug that signal SteeringWheelSpeechCtrlBtn can not be
received in UOS. the rootcause is signal SteeringWheelSpeechCtrlBtn and
signal SteeringWheelPauseBtn are combined into one multi-signal message and
signal SteeringWheelPauseBtn is not defined.
To fix this, add SteeringWheelPauseBtn definition.

Tracked-On: #1410
Signed-off-by: Yuan Liu <yuan1.liu@intel.com>
Acked-by: Yu Wang <yu1.wang@intel.com>

Author: yliu80

devicemodel/hw/platform/ioc.c

@@ -270,6 +270,7 @@ static struct cbc_signal cbc_tx_signal_table[] = {
 	{(uint16_t)CBC_SIG_ID_SWSCB,	3,	CBC_ACTIVE},
 	{(uint16_t)CBC_SIG_ID_SWPLB,	3,	CBC_ACTIVE},
 	{(uint16_t)CBC_SIG_ID_SWPCB,	3,	CBC_ACTIVE},
+	{(uint16_t)CBC_SIG_ID_SWPSB,    3, 	CBC_ACTIVE},
 	{(uint16_t)CBC_SIG_ID_SWHB,	3,	CBC_ACTIVE},
 	{(uint16_t)CBC_SIG_ID_SWEB,	3,	CBC_ACTIVE},
 	{(uint16_t)CBC_SIG_ID_SWECB,	3,	CBC_ACTIVE},