Platform/NXP: Add Platform driver for LS1043 RDB board

Platform driver will be used for platform specific work.
At present, it populate i2c driver structure with platform
specific information and install RTC on i2c.

Signed-off-by: Meenakshi Aggarwal <meenakshi.aggarwal@nxp.com>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>