powerpc/t2080qds: enable eSDHC peripheral clock support

Enable eSDHC peripheral clock support. u-boot and linux will
use SD clock generated by peripheral clock instead of platform
clock.

Signed-off-by: Yangbo Lu <yangbo.lu@freescale.com>
Cc: York Sun <yorksun@freescale.com>
Cc: Pantelis Antoniou <panto@antoniou-consulting.com>
Reviewed-by: York Sun <yorksun@freescale.com>

include/configs/T208xQDS.h

@@ -757,6 +757,7 @@ unsigned long get_board_ddr_clk(void);
 #ifdef CONFIG_MMC
 #define CONFIG_CMD_MMC
 #define CONFIG_FSL_ESDHC
+#define define CONFIG_FSL_ESDHC_USE_PERIPHERAL_CLK
 #define CONFIG_SYS_FSL_ESDHC_ADDR	CONFIG_SYS_MPC85xx_ESDHC_ADDR
 #define CONFIG_SYS_FSL_ESDHC_BROKEN_TIMEOUT
 #define CONFIG_SYS_FSL_MMC_HAS_CAPBLT_VS33