power: reset: at91-sama5d2_shdwc: fix wkupdbc mask

According to datasheet WKUPDBC mask is b/w bits 26..24.

Fixes: f80cb488 ("power: reset: at91-shdwc: add new shutdown controller driver")
Signed-off-by: NClaudiu Beznea <claudiu.beznea@microchip.com>
Reviewed-by: NAlexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: NSebastian Reichel <sebastian.reichel@collabora.com>

drivers/power/reset/at91-sama5d2_shdwc.c

@@ -37,7 +37,7 @@
 
 #define AT91_SHDW_MR	0x04		/* Shut Down Mode Register */
 #define AT91_SHDW_WKUPDBC_SHIFT	24
-#define AT91_SHDW_WKUPDBC_MASK	GENMASK(31, 16)
+#define AT91_SHDW_WKUPDBC_MASK	GENMASK(26, 24)
 #define AT91_SHDW_WKUPDBC(x)	(((x) << AT91_SHDW_WKUPDBC_SHIFT) \
 						& AT91_SHDW_WKUPDBC_MASK)