feat(cpus): add ENABLE_ERRATA_ALL flag

Now that all errata flags are all conveniently in a single list we can
make sweeping decisions about their values. The first use-case is to
enable all errata in TF-A. This is useful for CI runs where it is
impractical to list every single one. This should help with the long
standing issue of errata not being built or tested.

Also add missing CPUs with errata to `ENABLE_ERRATA_ALL` to enable all
errata builds in CI.

Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
Change-Id: I2b456d304d7bf3215c7c4f4fd70b56ecbcb09979
(cherry picked from commit 593ae35435f855ff3e48facc6a049261c0c37ea7)
diff --git a/make_helpers/defaults.mk b/make_helpers/defaults.mk
index d6c09de..deb89ae 100644
--- a/make_helpers/defaults.mk
+++ b/make_helpers/defaults.mk
@@ -106,6 +106,10 @@
 # Flag to enable exception handling in EL3
 EL3_EXCEPTION_HANDLING		:= 0
 
+# Flag to include all errata for all CPUs TF-A implements workarounds for
+# Its supposed to be used only for testing.
+ENABLE_ERRATA_ALL		:= 0
+
 # By default BL31 encryption disabled
 ENCRYPT_BL31			:= 0