Update config files: disable MFD_SYSCON on non-arm
    
    Disable MFD_SYSCON, GPIO_SYSCON and LEDS_SYSCON in non-arm
    configurations. SYSCON is an arm thing, it was enabled accidentally
    in other configurations because STMMAC_PLATFORM and
    TOUCHSCREEN_TS4800, which were once enabled by accident, select it.
    
    As REGMAP_MMIO was also only selected by MFD_SYSCON, we can disable
    it too.