feat(measured_boot): update tb_fw_config with event log properties

Making tb_fw_config ready to pass the Event Log base address
and size information to BL2.

Change-Id: I5dd0e79007e3848b5d6d0e69275a46c2e9807a98
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>

docs/components/measured_boot/event_log.rst

@@ -9,7 +9,7 @@ Dynamic configuration for Event Log
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 Measured Boot driver expects a *tpm_event_log* node with the following field
-in 'nt_fw_config' and 'tsp_fw_config' DTS files:
+in 'tb_fw_config', 'nt_fw_config' and 'tsp_fw_config' DTS files:
 
 - compatible [mandatory]
    - value type: <string>

plat/arm/board/fvp/fdts/fvp_tb_fw_config.dts

@@ -104,6 +104,10 @@
 	#include "cot_descriptors.dtsi"
 #endif
 
+#if MEASURED_BOOT
+	#include "event_log.dtsi"
+#endif
+
 };
 
 #if COT_DESC_IN_DTB