mmc: am654_sdhci: Add support for AM65x SR2.0

Add Support for AM65x PG2.0. Use the SoC bus framework to fixup
the platform data and do DLL calibration if the revision is 1.0

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>