clk: at91: pmc: add sama7g5 to the list of available pmcs

Add SAMA7G5 to the list of available PMCs such that the suspend/resume
code for clocks to be used on backup mode.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20211011112719.3951784-7-claudiu.beznea@microchip.com


Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>