clk: at91: clk-master: add 5th divisor for mck master

clk-master can have 5 divisors with a field width of 3 bits
on some products.

Change the mask and number of divisors accordingly.

Reported-by: Mihai Sain <mihai.sain@microchip.com>
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
diff --git a/drivers/clk/at91/clk-master.c b/drivers/clk/at91/clk-master.c
index 759df93..5d93e6a 100644
--- a/drivers/clk/at91/clk-master.c
+++ b/drivers/clk/at91/clk-master.c
@@ -24,7 +24,7 @@
 #define MASTER_PRES_MASK	0x7
 #define MASTER_PRES_MAX		MASTER_PRES_MASK
 #define MASTER_DIV_SHIFT	8
-#define MASTER_DIV_MASK		0x3
+#define MASTER_DIV_MASK		0x7
 
 #define PMC_MCR			0x30
 #define PMC_MCR_ID_MSK		GENMASK(3, 0)