feat(cpus): add more errata framework helpers

Figuring out the naming format of errata is annoying, so add a shorthand
for the custom checker functions. Also add some more semantic macros
instead of passing around constants.

Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
Change-Id: Ibdcf72146738026df4ebd047bfb30790fd4a1053
diff --git a/include/lib/cpus/errata.h b/include/lib/cpus/errata.h
index f8f9555..b280435 100644
--- a/include/lib/cpus/errata.h
+++ b/include/lib/cpus/errata.h
@@ -64,6 +64,10 @@
 #define CVE(year, id)		year, id
 #define NO_ISB			1
 #define NO_ASSERT		0
+#define NO_APPLY_AT_RESET	0
+#define APPLY_AT_RESET		1
+/* useful for errata that end up always being worked around */
+#define ERRATUM_ALWAYS_CHOSEN	1
 
 #endif /* __ASSEMBLER__ */