Set Rev 2.x 86xx PIC in mixed mode.

Prevent false interrupt from hanging Linux as MSR[EE] is set
to enable interrupts by changing the PIC out of the default
pass through mode into mixed mode.

Signed-off-by: Haiying Wang <haiying.wang@freescale.com>
Signed-off-by: Jon Loeliger <jdl@freescale.com>

include/asm-ppc/immap_86xx.h

@@ -721,6 +721,8 @@ typedef struct ccsr_pic {
 	uint	frr;		/* 0x41000 - Feature Reporting Register */
 	char	res10[28];
 	uint	gcr;		/* 0x41020 - Global Configuration Register */
+#define MPC86xx_PICGCR_RST	0x80000000
+#define MPC86xx_PICGCR_MODE	0x20000000
 	char	res11[92];
 	uint	vir;		/* 0x41080 - Vendor Identification Register */
 	char	res12[12];