powerpc/ifc: fix invalid CSn FTIM2.TCH setting

On some platforms, CSn FTIM2.TCH is set to zero which is invalid,
an invalid hold time makes DUT timing variances, whether it works
or not on luck.

Signed-off-by: Shaohui Xie <Shaohui.Xie@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
diff --git a/include/configs/B4860QDS.h b/include/configs/B4860QDS.h
index 1af9ba6..43c9df0 100644
--- a/include/configs/B4860QDS.h
+++ b/include/configs/B4860QDS.h
@@ -340,7 +340,7 @@
 #define CONFIG_SYS_CS3_FTIM1		(FTIM1_GPCM_TACO(0x0e) | \
 					FTIM1_GPCM_TRAD(0x1f))
 #define CONFIG_SYS_CS3_FTIM2		(FTIM2_GPCM_TCS(0x0e) | \
-					FTIM2_GPCM_TCH(0x0) | \
+					FTIM2_GPCM_TCH(0x8) | \
 					FTIM2_GPCM_TWP(0x1f))
 #define CONFIG_SYS_CS3_FTIM3		0x0