MIPS: Lantiq: Fix mask of GPE frequency

The hardware documentation says bit 11:10 are used for the GPE
frequency selection. Fix the mask in the define to match these bits.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Thomas Langer <thomas.langer@intel.com>
Cc: linux-mips@linux-mips.org
Cc: john@phrozen.org
Patchwork: https://patchwork.linux-mips.org/patch/14648/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/lantiq/falcon/sysctrl.c

@@ -24,7 +24,7 @@
 
 /* GPE frequency selection */
 #define GPPC_OFFSET		24
-#define GPEFREQ_MASK		0x00000C0
+#define GPEFREQ_MASK		0x0000C00
 #define GPEFREQ_OFFSET		10
 /* Clock status register */
 #define SYSCTL_CLKS		0x0000