fix(spm): add ARM_ARCH_MAJOR option

Add ARM_ARCH_MAJOR=8 option to SPM tf configs already specifying
ARM_ARCH_MINOR=5. This is to avoid any ambiguity on the architectural
major version in particular when one or both the options is forced by
the build flow of platform.

Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: I7be6dfabbc230a4d08242dae834689ebc84567b8
diff --git a/tf_config/fvp-spm-optee-sp b/tf_config/fvp-spm-optee-sp
index d4b76bd..4f1e7d8 100644
--- a/tf_config/fvp-spm-optee-sp
+++ b/tf_config/fvp-spm-optee-sp
@@ -1,3 +1,4 @@
+ARM_ARCH_MAJOR=8
 ARM_ARCH_MINOR=5
 CTX_INCLUDE_PAUTH_REGS=1
 ENABLE_FEAT_MTE2=1