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a6e0d5ed60
1) Shifted the clock speed of MK20DX128VLH5 to 48 Mhz to be
able to uses USB.
2) Set BOARD_OUTDIV3 to 0 - there is no BOARD_OUTDIV3 on a
MK20DX128VLH5 or K20DX256VLH7
3) Added BOARD_SOPT2_PLLFLLSEL and BOARD_SOPT2_FREQ along with
settings for BOARD_SIM_CLKDIV2_USBFRAC and
BOARD_SIM_CLKDIV2_USBDIV base on the BOARD_SOPT2_FREQ.