us ticker API - get_us_ticker_data, us_ticker_irq_handler - declaration should live elsewhere

[0xc0170]

These 2 functions are implemented in mbed-drivers, and are generic for any us ticker. We might consider adding notes to the header file or move these declarations elsewhere

/** Get ticker's data
 *
 * @return The low power ticker data
 */
const ticker_data_t* get_us_ticker_data(void);


/** The wrapper for ticker_irq_handler, to pass us ticker's data
 *
 */
void us_ticker_irq_handler(void);

File reference: https://github.com/ARMmbed/mbed-hal/blob/master/mbed-hal/us_ticker_api.h#L35

[ciarmcom]

ARM Internal Ref: IOTSFW-2147