mmc: sdhci-msm: Update pr_err condition in DLL init path

eMMC device operating at 1.8 V can be run up to 100 MHz without SDCDC
(DLL) and with DLL above 100 MHz.

Change the existing pr_err condition to less than 100MHz.

Change-Id: Ia6575ddfd0e4dc57723226e3dff24ad485a1a2ea
Signed-off-by: Sarthak Garg <sartgarg@codeaurora.org>