usb: renesas_usbhs: remove controlling PWEN/EXTLP support

Controlling PWMEN/EXTLP (named as "has_otg") was supported in v3.2,
but the last user (kzm9g) was removed by the commit 30f8925a57d8ad49
("ARM: shmobile: Remove legacy board code for KZM-A9-GT"). So, this
patch remove it.

Signed-off-by: Yoshihiro Shimoda <[e-mail]>
Reviewed-by: Geert Uytterhoeven <[e-mail]>
Reviewed-by: Simon Horman <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/renesas_usbhs/common.c

···
 {
 	u16 mask = DCFM | DRPD | DPRPU | HSE | USBE;
 	u16 val  = DCFM | DRPD | HSE | USBE;
-	int has_otg = usbhs_get_dparam(priv, has_otg);
-
-	if (has_otg)
-		usbhs_bset(priv, DVSTCTR, (EXTLP | PWEN), (EXTLP | PWEN));
 
 	/*
 	 * if enable

include/linux/usb/renesas_usbhs.h

···
 	/*
 	 * option:
 	 */
-	u32 has_otg:1; /* for controlling PWEN/EXTLP */
 	u32 has_usb_dmac:1; /* for USB-DMAC */
 	u32 runtime_pwctrl:1;
 	u32 has_cnen:1;