Comment incorrectly cites errata 39
    E39. SDIO: SDIO Devices Not Working at 19.5 Mbps

Should be errata 38
    E38. MEMC: Memory Controller hangs when entering Self Refresh Mode.
Signed-off-by: NAndrew Ruder <andrew.ruder@elecsyscorp.com>
Acked-by: NHaojian Zhuang <haojian.zhuang@linaro.org>