mmc: sdhci-msm: Invalidate pin drive type data if it's not present

Pin drive-type data for different clock-rates would be read from
the device tree.  In case if this data is not present in dt, then
invalidate the data-structures related to this drive-type data.

Without invalidating this data, it will have non-zero values
(error value returned by pinctrl_lookup_state()), which is causing issues.

Change-Id: I0efbd19ed883b9f95be2e073e54303a6a19ee569
Signed-off-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org>