[ARM] mmp: support ssp in pxa168

Support ssp devices in PXA168. PXA168 could reuse the code of PXA SSP.

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
diff --git a/arch/arm/plat-pxa/ssp.c b/arch/arm/plat-pxa/ssp.c
index 5fe2301..cfebcd8 100644
--- a/arch/arm/plat-pxa/ssp.c
+++ b/arch/arm/plat-pxa/ssp.c
@@ -192,6 +192,7 @@
 	{ "pxa25x-ssp",		PXA25x_SSP },
 	{ "pxa25x-nssp",	PXA25x_NSSP },
 	{ "pxa27x-ssp",		PXA27x_SSP },
+	{ "pxa168-ssp",		PXA168_SSP },
 	{ },
 };