ivory-bsp-tests - spi test is periodic rather than user input triggered
ivory-bsp-tests: rename complex spi test to bsp-mpu6000-test

need to make a simpler test to figure out wtf is going on
hwf4: trivial changes to make it build without warnings for open407
ivory-bsp-tests: simple bsp-spi-test that does a blocking write
ivory-bsp-tests: fixup mpu6000
hwf4 spi tests: build for open407vc, make it easy to switch which periph