usb: phy: phy-msm-snps-hs: Update vdda18 voltage range

Update USB_HSPHY_1P8_VOL_MIN from 1800000uV to 1704000uV
as per the range defined in regulator framework,
otherwise regulator_set_voltage() fails.

Change-Id: I371a7561938a57b0522faaf197920a443f5fa541
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>