Allow configuring cpu frequency through board_build.f_cpu #54
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Allow configuring cpu frequency through the platformio
board_build.f_cpu. Fixes the potential bug where someone might try usingboard_build.f_cpuresulting in anF_CPUthat differs from the one actually configured (throughLPC_SC->PLL0CFG).F_CPUis used insystem/lpc176x/time.hfor thedelay*functions and is also widely used in projects like Marlin.Currently only allows 120mhz (LPC1769), 100mhz and 96mhz.