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Added RMC-RA4M1 (rev.2.0) to arduino/ArduinoCore-renesas

Add RMC-RA4M1(R7FA4M1AB3CFP) https://www2.himdx.net/mcr/product/download.html#ra4m1 The minimum required ```variants``` and ```boards.txt``` have been added from https://j-mcr.net/arduino_mcr/arduinocore-renesas_uno_mcr_rev20-1.0.4.tar.bz2.