Makefile: Align BITBANG_SPI with the other DEPENDS_ and USE_ configs

Drop not needed `-DCONFIG_BITBANG_SPI=1`

Change-Id: I2a519c929f7747af70568284823b51678751e285
Signed-off-by: Thomas Heijligen <thomas.heijligen@secunet.com>
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/63886
Original-Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/72327
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
1 file changed