mmc: sdhci-msm-ice: Factor out update config from sdhci_msm_ice_cfg

Factor out the logic of updating the SDHC ICE config registers
from sdhci_msm_ice_cfg().

For ICE3.0, different set of SDHC ICE registers are need to be updated.
So having this logic in separate functions, we can have logical
separation for ICE2.0 and ICE3.0.

Change-Id: Ib3d3f9701875000985dc9382bdcdf5fb0e872a43
Signed-off-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org>