Parametrize baudrate and UART clock during console_init()

This patch adds baud rate and UART clock frequency as parameters
to the pl011 driver api console_init(). This allows each platform
to specify UART clock and baud rate according to their specific
hardware implementation.

Fixes ARM-software/tf-issues#215

Change-Id: Id13eef70a1c530e709b34dd1e6eb84db0797ced2
diff --git a/plat/fvp/fvp_def.h b/plat/fvp/fvp_def.h
index 89c8b02..21edb3b 100644
--- a/plat/fvp/fvp_def.h
+++ b/plat/fvp/fvp_def.h
@@ -198,6 +198,13 @@
 #define PL011_UART2_BASE		0x1c0b0000
 #define PL011_UART3_BASE		0x1c0c0000
 
+#define PL011_BAUDRATE  115200
+
+#define PL011_UART0_CLK_IN_HZ 24000000
+#define PL011_UART1_CLK_IN_HZ 24000000
+#define PL011_UART2_CLK_IN_HZ 24000000
+#define PL011_UART3_CLK_IN_HZ 24000000
+
 /*******************************************************************************
  * TrustZone address space controller related constants
  ******************************************************************************/