ANDROID: remove unused xhci_get_endpoint_address export

In commit 731d2da9 ("ANDROID: usb: host: export xhci symbols for
ring management"), many xhci symbols were exported, but
xhci_get_endpoint_address was never actually used by any external
modules, so remove the export as it is unneeded.

Bug: 183761108
Bug: 203756332
Cc: Daehwan Jung <dh10.jung@samsung.com>
Fixes: 731d2da9 ("ANDROID: usb: host: export xhci symbols for ring management")
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I08aab7192297c832f5a9dd559a016e6ff1140b86