i2c: Staticize local functions in mxc i2c driver
Some functions in the MXC i2c driver were not static, fix this by
making them so.
Signed-off-by: NMarek Vasut <marex@denx.de>
Cc: Heiko Schocher <hs@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
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