CC2642R: power_shutdown wakeup pin & simplelink SDK 6.20

I'm trying to port a set of power pin that wkae up our custom board from 6.10 to 6.20 simplelink SDK 

last rev was using PIN driver that no longer exists on 6.20

```

/********** Wake-up Button pin table **********/
PIN_Config ButtonTableWakeUp[] = {
CONFIG_CHG | PIN_INPUT_EN | PIN_NOPULL | PINCC26XX_WAKEUP_NEGEDGE,
CONFIG_WAKE_UP | PIN_INPUT_EN | PIN_NOPULL | PINCC26XX_WAKEUP_NEGEDGE,
PIN_TERMINATE /* Terminate list */
};

[. . . ]

/// before Board_init() calling 

PIN_init(BoardGpioInitTable)

Board_init();

PINCC26XX_setWakeup(ButtonTableWakeUp);

```

I try to reproduce same behaviour in 6.20 SDK 

but I didnt fine something similar 

I just find a define in simplelink sdk doc called `GPIO_CFG_SHUTDOWN_WAKE_LOW`  I tried to setitup but after the call to GPIO_init() done in Board_Init()

```

GPIO_setConfig(WAKE_UP, GPIO_CFG_INPUT | GPIO_CFG_SHUTDOWN_WAKE_LOW);

```

but no results 

I didnt find any optional config options in sysconfig tool and I just define the pin as input 

stangely syscfg is defining it in `gpioPinConfigs` table as INTERNAL

```

GPIO_CFG_INPUT_INTERNAL | GPIO_CFG_IN_INT_NONE | GPIO_CFG_PULL_NONE_INTERNAL,

```

I've search a bit on forums to find some similar questions but as 6.20 sdk is a bit recent I didn't find any answer ... 

thank's for any help