arm64: defconfig: Enable RTC_DRV_HYM8563

RTC HYM8563 used in the ARM64 Rockchip SoC's SDIO power
sequence enablement.

Enable it as module.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Link: https://lore.kernel.org/r/20201023181814.220974-1-jagan@amarulasolutions.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>