Revert "mmc: s5p_sdhci: unset the SDHCI_QUIRK_BROKEN_R1B"

This reverts commit a034ec06.

Commit 4a3ea75d ("Revert "mmc: sdhci: set to INT_DATA_END when
there are data"") reverted the alternative fix that was added for
Exynos 4 devices, causing an error when trying to boot from an sdcard:

    <...>
    Loading Environment from MMC... sdhci_send_command: Timeout for status update!
    mmc fail to send stop cmd
    <...>

Re-add the quirk to allow booting from sdcards again.

Signed-off-by: Henrik Grimler <henrik@grimler.se>