mmc: sdhci_am654: Add support for PM suspend/resume

Add support for suspend/resume and pm_runtime resume/suspend.

Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
Signed-off-by: Georgi Vlaev <g-vlaev@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Link: https://lore.kernel.org/r/20230331101619.4117312-1-vigneshr@ti.com


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>