usb: tegra: fix USB2 powerdown for Tegra30 and later

Clear the forced powerdown bit in the UTMIP_PLL_CFG2_0 register
which brings USB2 in UTMI mode to work. This was clearly missing
since the forced powerdown bit is set in reset by default for all
USB ports.

Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Stefan Agner <stefan@agner.ch>
Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>

drivers/usb/host/ehci-tegra.c

@@ -461,6 +461,9 @@ static int init_utmi_usb_controller(struct fdt_usb *config)
 		if (config->periph_id == PERIPH_ID_USBD)
 			clrbits_le32(&clkrst->crc_utmip_pll_cfg2,
 				     UTMIP_FORCE_PD_SAMP_A_POWERDOWN);
+		if (config->periph_id == PERIPH_ID_USB2)
+			clrbits_le32(&clkrst->crc_utmip_pll_cfg2,
+				     UTMIP_FORCE_PD_SAMP_B_POWERDOWN);
 		if (config->periph_id == PERIPH_ID_USB3)
 			clrbits_le32(&clkrst->crc_utmip_pll_cfg2,
 				     UTMIP_FORCE_PD_SAMP_C_POWERDOWN);