fix(PeriphDrivers): Fix bad logic on ME16 UART IDX checking in MXC_UART_SetClockSource.

[Brandon-Hurst]

Description

ME16 (MAX32675) will currently always fail to initialize its UART. This is because the logic inside the SetClockSource function uses an || instead of an && for checking mutually exclusive conditions:

// FIXME: CHANGE FROM || TO &&
    if (MXC_UART_GET_IDX(uart) != 0 || MXC_UART_GET_IDX(uart) != 2) { 
        return E_BAD_PARAM;
    }

Because the UART is for sure either 0 or 2, this check will always fail. The correct operation is to use && for this sort of check. That's the only change in this PR.