Marvell/Drivers: MvBoardDesc: Extend protocol with I2C support

Introduce new callback that can provide information
about I2C controllers to the I2c driver.

Extend ArmadaBoardDescLib with new structure MV_BOARD_I2C_DESC,
for holding board specific data. In further steps it should
be extended and replace PCD I2C devices' representation with the
appropriate structures.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Marcin Wojtas <mw@semihalf.com>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>