ARM: at91: Kconfig: select PM_OPP

Select PM_OPP. This is requested for CPUFreq driver.
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20220113144900.906370-6-claudiu.beznea@microchip.com

arch/arm/mach-at91/Kconfig

@@ -63,6 +63,7 @@ config SOC_SAMA7G5
 	select HAVE_AT91_GENERATED_CLK
 	select HAVE_AT91_SAM9X60_PLL
 	select HAVE_AT91_UTMI
+	select PM_OPP
 	select SOC_SAMA7
 	help
 	  Select this if you are using one of Microchip's SAMA7G5 family SoC.