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>
diff --git a/docs/components/measured_boot/event_log.rst b/docs/components/measured_boot/event_log.rst
index 5347dcc..0881248 100644
--- a/docs/components/measured_boot/event_log.rst
+++ b/docs/components/measured_boot/event_log.rst
@@ -9,7 +9,7 @@
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 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>