src/drivers/usb/Kconfig: increase warning signs for BBB owners

The help text is already very clear but some users (first and
foremost the author of this patch ;) are still selecting
USBDEBUG_DONGLE_BEAGLEBONE when using a BeagleBone Black and
waste hours on analyzing the debug output of EHCI debug driver.

Change-Id: Ibf002db7d81ed44878f3ce0324170e4b99e780a5
Signed-off-by: Stefan Tauner <stefan.tauner@gmx.at>
Reviewed-on: https://review.coreboot.org/28184
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
1 file changed