drivers: pm: sam: add code for enable/disable sama7g5 DRAM self-refresh mode

Add the header file "sama7-ddr.h" for sama7g5 DRAM controller.
Add 2 macros for enable and disable sama7g5 DRAM self-refr

drivers: pm: sam: add code for enable/disable sama7g5 DRAM self-refresh mode

Add the header file "sama7-ddr.h" for sama7g5 DRAM controller.
Add 2 macros for enable and disable sama7g5 DRAM self-refresh mode.
Enable self-refresh mode before entering the low-power modes and
disable it after exiting the low-power modes.

Signed-off-by: Tony Han <tony.han@microchip.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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