i2c: algo-bit: include main i2c header

We are using symbols from it, so we should include it directly. Found
after sorting includes in a driver.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>