#758 Bogus register in board.c of MINIPRO

[Igor Stoppa]

MINIPRO uses the ATMega328p, which has only EICRA, but the board file tryes to set also EICRB, which is not present and generates a build error.

@os/hal/boards/SPARKFUN_PRO_MICRO/board.c:72 EICRB = 0x00;

Must be removed.

Found on top of:

commit 0791baebdc187dccde2efa2084b9c976afa53316
Author: Giovanni Di Sirio gdisirio@gmail.com
Date: Sat Jun 18 09:18:47 2016 +0000

Fixed bugs #756 and #757.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@9642 35acf78f-673a-0410-8e92-d51de3d6d3f4