ti: common: Remove additional i2c read for board detection

There shouldn't be a need to call additional i2c read if above failed
already. Based on comment it should be enough to try to detect legacy
boards which are mentioned in the comment.

Fixes: 2463f672 ("ti: common: board_detect: Allow DM I2C without CONFIG_DM_I2C_COMPAT")
Fixes: 0bea813d ("ARM: omap-common: Add standard access for board description EEPROM")
Signed-off-by: Michal Simek <michal.simek@xilinx.com>