mmc: sdhci: Vote for the required MSM bus bandwidth

Vote for the MSM bus bandwidth required by SDHC driver
based on the speed and bus width of the card. Otherwise,
the system clocks may run at minimum clock speed and
thus affecting the performance.

Change-Id: Icf0c8710adbe2770f4eae283a50f4a13671f703f
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>