powerpc/t4qds: Fix disabling remote I2C connection

Only clear IRE bit in qixis brdcfg5 register and keep other bits
unchanged.

Signed-off-by: Ed Swarthout <Ed.Swarthout@freescale.com>
Signed-off-by: York Sun <yorksun@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
diff --git a/board/freescale/t4qds/t4qds.c b/board/freescale/t4qds/t4qds.c
index a84218c..be6d1c4 100644
--- a/board/freescale/t4qds/t4qds.c
+++ b/board/freescale/t4qds/t4qds.c
@@ -504,8 +504,8 @@
 	setup_portals();
 #endif
 
-	/* Disable remote I2C connectoin */
-	QIXIS_WRITE(brdcfg[5], BRDCFG5_RESET);
+	/* Disable remote I2C connection to qixis fpga */
+	QIXIS_WRITE(brdcfg[5], QIXIS_READ(brdcfg[5]) & ~BRDCFG5_IRE);
 
 	/*
 	 * Adjust core voltage according to voltage ID