mmc: rockchip_sdhci: Update speed mode controls in set_ios_post

Refactor set_ios_post ops to correctly set UHS Speed Select field values
according to TRM. Also set or unset Enhanced Strobe Enable bit and
eMMC Card present bit in set_ios_post, the Enhanced Strobe Enable bit
was never unset after switching to HS400ES mode.

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