The board can be flashed without adding a diode by just leaving VCC
unconnected. Rework the flashing section to describes that.
Change-Id: I37d55ffdbcfba4f3a1113a82f16ec8766bbb6e6c
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52679
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
