fuzz: Add fuzzing for core and i2c

Add fuzzing infrastructure and a fuzz target handling mctp-i2c packets.
After running for a few days with honggfuzz this achieves close to
complete line coverage o

fuzz: Add fuzzing for core and i2c

Add fuzzing infrastructure and a fuzz target handling mctp-i2c packets.
After running for a few days with honggfuzz this achieves close to
complete line coverage of core.c

Change-Id: I6cd7361e6f600831a319f06fb7c7c0d2186fd7de
Signed-off-by: Matt Johnston <matt@codeconstruct.com.au>

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