trogdor: Assert EN_PP3300_HUB

Some Trogdor variants power their USB hub from a PMIC LDO that is
already enabled by QcLib, and some have a discrete LDO that is
controlled by GPIO_84. For the latter, let's make sure we assert that
GPIO on boot.

Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: I9d206cd7154ded3bf179e68c2b1421d0a8ee89f2
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44744
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: mturney mturney <mturney@codeaurora.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Philip Chen <philipchen@google.com>

src/mainboard/google/trogdor/mainboard.c

@@ -12,6 +12,9 @@ static struct usb_board_data usb0_board_data = {
 
 static void setup_usb(void)
 {
+	/* Assert EN_PP3300_HUB for those board variants that use it. */
+	gpio_output(GPIO(84), 1);
+
 	setup_usb_host0(&usb0_board_data);
 }