USB: phy-msm-usb: Drop the 45nm chipidea PHY support

The 45nm chipidea PHY is not present on any of the active targets on
which this driver is used. Remove the 45nm PHY specific code.

Change-Id: I7662f6dfb15f5886d64cea603bd8d58891adcd80
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>