mvebu: turris_omnia: Fix PEX vs SATA detection for board topology
The I2C reading in the PEX vs SATA detection code often fails on the first try. Try three times, as the code for EEPROM reading does. Signed-off-by: NMarek Behun <marek.behun@nic.cz> Signed-off-by: NStefan Roese <sr@denx.de>
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