mmc: sdhci-msm: Introduce timeout freq divider in sdhci host

Some SD host controllers multiplies the timeout-clk internally while
deriving the timeout value. So allow vendor driver to update the
timeout-clock to get the correct data timeout counter value.

Change-Id: Iacbd98f5251d5312c999478b0d0aac3abc339323
Suggested-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org>
Signed-off-by: Sarthak Garg <sartgarg@codeaurora.org>