mpc83xx: Fix the bug of serdes initialization

Currently the serdes will not be initializated due to the
partid's error.

Signed-off-by: Dave Liu <daveliu@freescale.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>

board/freescale/mpc837xemds/mpc837xemds.c

@@ -36,7 +36,7 @@ int board_early_init_f(void)
 	u32 spridr = in_be32(&immr->sysconf.spridr);
 
 	/* we check only part num, and don't look for CPU revisions */
-	switch (spridr) {
+	switch (PARTID_NO_E(spridr)) {
 	case SPR_8377:
 		fsl_setup_serdes(CONFIG_FSL_SERDES1, FSL_SERDES_PROTO_SATA,
 				 FSL_SERDES_CLK_100, FSL_SERDES_VDD_1V);