EMW3165 and WWD_PIN_32K_CLK

[AriZuu]

GPIO pin for WWD_PIN_32K_CLK is not defined in EMW3165 platform.c. However, WICED_USE_WIFI_32K_CLOCK_MCO is defined in platform_config.h, which causes
code in STM32F4xx/WWD/wwd_platform.c:host_platform_init_wlan_powersave_clock()
to attempt setup with undefined values.

EMW3162 platform files seem to define WWD_PIN_32K_CLK, but there is no documentation if same solution would be suitable for EMW3165. Workaround seems to be to leave WICED_USE_WIFI_32K_CLOCK_MCO undefined.