drivers: soc: atmel: use GENMASK

Use GENMASK() to define CIDR match mask.
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/1611318097-8970-3-git-send-email-claudiu.beznea@microchip.com

drivers/soc/atmel/soc.c

@@ -27,7 +27,7 @@
 #define AT91_CHIPID_EXID		0x04
 #define AT91_CIDR_VERSION(x)		((x) & 0x1f)
 #define AT91_CIDR_EXT			BIT(31)
-#define AT91_CIDR_MATCH_MASK		0x7fffffe0
+#define AT91_CIDR_MATCH_MASK		GENMASK(30, 5)
 
 static const struct at91_soc __initconst socs[] = {
 #ifdef CONFIG_SOC_AT91RM9200