powerpc/powernv: Kconfig: Replace single quotes

Replace single quotes with double quotes which seems to be the convention
for strings.
Signed-off-by: Juerg Haefliger <juergh@canonical.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220520115229.147368-1-juergh@canonical.com

arch/powerpc/platforms/powernv/Kconfig

@@ -20,7 +20,7 @@ config PPC_POWERNV
 	default y
 
 config OPAL_PRD
-	tristate 'OPAL PRD driver'
+	tristate "OPAL PRD driver"
 	depends on PPC_POWERNV
 	help
 	  This enables the opal-prd driver, a facility to run processor