ANDROID: db845c_gki.fragment: Remove USB_XHCI_HCD and XHCI_PCI_RENESAS configs

Since commit db102bc6 ("ANDROID: GKI: Enable CONFIG_USB_XHCI_HCD")
android-mainline stopped booting on db845c, as the xhci modules
would fail to load (since its now built in functionality).

This patch resolves it by removing the USB_XHCI_HCD and
XHCI_PCI_RENESAS config options from the config fragment.

Fixes: db102bc6 ("ANDROID: GKI: Enable CONFIG_USB_XHCI_HCD")
Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: I2d10bd4af490e1ce13466e53f82c66d8bcac2d09
Signed-off-by: Matthias Maennich <maennich@google.com>