MLK-20011-1 usb: chipidea: imx: using non-core register to pull up DP

MLK-20011-1 usb: chipidea: imx: using non-core register to pull up DP

For Samsung PHY SoCs (imx7d/imx845), we used core register usbcmd.rs
to pull up DP to finish the pre-condition for secondary USB charger
detection before. In fact, there are some non-core registers can
fulfill the same task, in that way, we could not touch the common
chipidea registers.

Meanwhile, we delete the secondary charger detection operation and
clean up related code.

Reviewed-by: Jun Li <jun.li@nxp.com>
Signed-off-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Vipul Kumar <vipul_kumar@mentor.com>