i2c: mvtwsi: Fix problem with baud rate calculation

i2c: mvtwsi: Fix problem with baud rate calculation

The current implementation for baudrate calculation is incorrect.
This part from the formula:

"2 ^ (n + 1)" is not equivalent to (1 << n) but to (2 << n)!

This patch fixes this and moves this calculation to a function instead of using a macro.
This new function is taken from the Linux kernel.

This was detected and tested on the Marvell Armada A38x DB-88F6820-GP eval board.

Signed-off-by: Stefan Roese <[email protected]>
Cc: Prafulla Wadaskar <[email protected]>
Cc: Luka Perkov <[email protected]>
Cc: Hans de Goede <[email protected]>
Cc: Ian Campbell <[email protected]>
Cc: Heiko Schocher <[email protected]>
Acked-by: Hans de Goede <[email protected]>