mmc: rockchip_sdhci: Skip blocks read workaround on RK3399

The workaround to limit number of blocks to read in a single command
should only be applied to RK3568 and RK3588. Change to be more strict
when to apply the workaround.

Fixes: 2cc6cde6 ("mmc: rockchip_sdhci: Limit number of blocks read in a single command")
Suggested-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Tested-by: Quentin Schulz <foss+uboot@0leil.net> # RK3399 Puma, RK3588 Tiger