intel: stratix10: Fix reliance on hard coded clock information

Extract clock information for UART, MMC & Watchdog from the platform
rather than hard code it

Signed-off-by: Hadi Asyrafi <muhammad.hadi.asyrafi.abdul.halim@intel.com>
Change-Id: I2582bd34a6da97bd75d5ccba5f93840e65f26b03
diff --git a/plat/intel/soc/stratix10/include/stratix10_private.h b/plat/intel/soc/stratix10/include/stratix10_private.h
index f437202..85aff3a 100644
--- a/plat/intel/soc/stratix10/include/stratix10_private.h
+++ b/plat/intel/soc/stratix10/include/stratix10_private.h
@@ -10,9 +10,9 @@
 #define S10_MMC_REG_BASE	0xff808000
 
 #define EMMC_DESC_SIZE		(1<<20)
-#define EMMC_INIT_PARAMS(base)			\
+#define EMMC_INIT_PARAMS(base, clk)			\
 	{	.bus_width = MMC_BUS_WIDTH_4,	\
-		.clk_rate = 50000000,		\
+		.clk_rate = (clk),		\
 		.desc_base = (base),		\
 		.desc_size = EMMC_DESC_SIZE,	\
 		.flags = 0,			\