boards: Replace CFLAGS defines with Make variables
#531
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Move modifying
CFLAGStocommon.mkso that boards only set configs by Make variables.The only remaining use of
CFLAGSin board Makefiles is for including headers from another directory to minimize duplicate files for model refreshes.This also adds the
CONFIG_prefix toCHARGERandKBLED.Test: Build with
VERSION=0is identical.Resolves: #443