MLK-20045-1 usb: chipidea: usbmisc_imx: using different .init for imx7ulp

MLK-20045-1 usb: chipidea: usbmisc_imx: using different .init for imx7ulp

imx7ulp uses different USB PHY with imx7d (MXS PHY vs PICO PHY), so the
features are supported by non-core register are a little different.
For example, autoresume feature is supported by all controllers for
imx7ulp, but for imx7d, it is only supported by non-HSIC controller.

Since imx7d has dedicated .init function, so the flag for imx7d PHY
(picophy) can be deleted.

Signed-off-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Vipul Kumar <vipul_kumar@mentor.com>