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Typically eMMC card have IO voltage different than card VDD
voltage and specification names it as VCCQ voltage. Currently
driver refers regulator powering VCCQ as sdc_vccq.

UHS-I (Ultra High Speed) SD cards may also have the IO voltage
different then card VDD voltage and there is no specification
defined name for it so driver refers regulator powering this
SD card IO voltage as sdc_vddp.

But ultimately both are referring to regulators powering IO voltage
so it makes sense to refer both (sdc_vccq & sdc_vddp) as
sdc_vdd_io regulator. So this patch combines them as sdc_vdd_io
regulator.

CRs-Fixed: 369258
Change-Id: Ieafffbaebc9843c0b8683b87d2bada6b7666c142
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>