powerpc/85xx: Add eSDHC support on P2020DS

We enable SDHC_CD and SDHC_WP signals (pin muxed with GPIO8 & GPIO9
respectively).

We enable EXT2, FAT, and parition support for both MMC & USB configs.

Signed-off-by: Jerry Huang <Chang-Ming.Huang@freescale.com>
Signed-off-by: Jin Qing <b24347@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

board/freescale/p2020ds/p2020ds.c

@@ -44,6 +44,19 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
+int board_early_init_f(void)
+{
+#ifdef CONFIG_MMC
+	ccsr_gur_t *gur = (ccsr_gur_t *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
+
+	setbits_be32(&gur->pmuxcr,
+			 (MPC85xx_PMUXCR_SDHC_CD |
+			 MPC85xx_PMUXCR_SDHC_WP));
+#endif
+
+	return 0;
+}
+
 int checkboard(void)
 {
 	u8 sw;