board/t2080rdb: reset cs4315 phy

CS4315 PHY doesn't support phy-reset by software, it
needs to reset it by hardware via CPLD control.

Signed-off-by: Shengzhou Liu <Shengzhou.Liu@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>

board/freescale/t208xrdb/cpld.h

@@ -40,3 +40,6 @@ void cpld_write(unsigned int reg, u8 value);
 #define CPLD_LBMAP_RESET	0xFF
 #define CPLD_LBMAP_SHIFT	0x03
 #define CPLD_BOOT_SEL		0x80
+
+/* RSTCON Register */
+#define CPLD_RSTCON_EDC_RST	0x04

board/freescale/t208xrdb/t208xrdb.c

@@ -107,6 +107,13 @@ unsigned long get_board_ddr_clk(void)
 
 int misc_init_r(void)
 {
+	u8 reg;
+
+	/* Reset CS4315 PHY */
+	reg = CPLD_READ(reset_ctl);
+	reg |= CPLD_RSTCON_EDC_RST;
+	CPLD_WRITE(reset_ctl, reg);
+
 	return 0;
 }