Replace flash partitioning terminology

This change replaces the slot 0/1 terminology with primary/secondary
slot and replaces FLASH_AREA_IMAGE_0/1 with
FLASH_AREA_IMAGE_PRIMARY/SECONDARY. This naming convention may be more
understandable, fits better to MCUs with multiple images and it is an
architecture agnostic alternative as well.

Change-Id: I655a585f6ae023852c671ee6635399efe25209c9
Signed-off-by: David Vincze <david.vincze@arm.com>
Signed-off-by: David Brown <david.brown@linaro.org>
diff --git a/ci/sim_run.sh b/ci/sim_run.sh
index 0492cff..b0b70f7 100755
--- a/ci/sim_run.sh
+++ b/ci/sim_run.sh
@@ -17,7 +17,7 @@
 EXIT_CODE=0
 
 if [[ ! -z $SINGLE_FEATURES ]]; then
-  all_features="sig-rsa sig-ecdsa overwrite-only validate-slot0 enc-rsa enc-kw boostrap"
+  all_features="sig-rsa sig-ecdsa overwrite-only validate-primary-slot enc-rsa enc-kw boostrap"
 
   if [[ $SINGLE_FEATURES =~ "none" ]]; then
     echo "Running cargo with no features"