Fix misuse of ALWAYS_INLINE in atmega::SpiMaster.
Fix misuse of ALWAYS_INLINE in atmega::SpiMaster.

dergraaf/xpcc,dergraaf/xpcc,chrism333/xpcc,chrism333/xpcc,dergraaf/xpcc,dergraaf/xpcc,chrism333/xpcc,chrism333/xpcc