bootloader/atmel_start: Disable Address Match and PREC interrupt
If enabled there is wrong data returned via i2c, like:
$ i2cdump -y 9 0x12 s 0x9a
0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef
00: 22 44 88 49 92 4f 9e 54 a8 20 40 4d 9a 6f de 6e "D?I?O?T? @M?o?n
10: dc
Signed-off-by: Adam Wujek <dev_public@wujek.eu>
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