ARM: dts: microchip: at91-sama7g5ek: Replace regulator-suspend-voltage with the valid...

ARM: dts: microchip: at91-sama7g5ek: Replace regulator-suspend-voltage with the valid property

By checking the pmic node with microchip,mcp16502.yaml#
'regulator-suspend-voltage' does not match any of the
regexes 'pinctrl-[0-9]+' from schema microchip,mcp16502.yaml#
which inherits regulator.yaml#. So replace regulator-suspend-voltage
with regulator-suspend-microvolt to avoid the inconsitency.

Fixes: 85b1304b9daa ("ARM: dts: at91: sama7g5ek: set regulator voltages for standby state")
Signed-off-by: Andrei Simion <[email protected]>
Acked-by: Nicolas Ferre <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[claudiu.beznea: added a dot before starting the last sentence in commit
 description]
Signed-off-by: Claudiu Beznea <[email protected]>