mmc: mmc: fix issue with clock scaling in HS200 mode

The scaling logic for HS400 is triggered when the card timing
mode is HS400 or when the clock rate is MMC_HS200_MAX_DTR. But
this is the same rate used in HS200 mode as well. Due to this,
in HS200 mode also, the card enters into the scaling logic meant
for HS400 which is not correct.

Correct this logic by checking the card timing in addition to the
clock rate in HS400 clock scaling logic.

Change-Id: If6261c0e42178d331184ac605c192d48a76e1e29
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>