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.