fix(tc): tc2 bl1 start address shifted by one page

Change [1] is specific to TC2 model and breaks former TC0/TC1 test
configs.
BL1 start address is 0x0 on TC0/TC1 and 0x1000 from TC2 onwards.
Fix by adding conditional defines depending on TARGET_PLATFORM build
flag.

[1] https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/15917

Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: I51f77e6a61ca8eaa6871c19cabe9deb1288f5a9d
diff --git a/plat/arm/board/tc/platform.mk b/plat/arm/board/tc/platform.mk
index 3acd88e..18fcd54 100644
--- a/plat/arm/board/tc/platform.mk
+++ b/plat/arm/board/tc/platform.mk
@@ -1,4 +1,4 @@
-# Copyright (c) 2021, Arm Limited. All rights reserved.
+# Copyright (c) 2021-2022, Arm Limited. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -9,6 +9,8 @@
         $(error TARGET_PLATFORM must be 0 or 1)
 endif
 
+$(eval $(call add_define,TARGET_PLATFORM))
+
 CSS_LOAD_SCP_IMAGES	:=	1
 
 CSS_USE_SCMI_SDS_DRIVER	:=	1