rockchip: rk3588: Enable eMMC HS200 mode

Writing to eMMC using HS200 mode work more reliably then other modes on
RK3588 boards.

Enable MMC_HS200_SUPPORT Kconfig option to prefer use of HS200 mode.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Weizhao Ouyang <o451686892@gmail.com>