all pios_spi: added non freertos handling of claim and release
all pios_spi: astyle format run
all pios_spi: fixed potential deadlock in non freertos mode
Merge pull request #552 from lilvinz/spi_fixes

Spi fixes
Merge remote-tracking branch 'taulabs/next' into sc/vrbrain-next
cleaning comments
 STM32F4xx_Vrbrain.h
at45 flash files was deleted
switching the board to use internal flash