CI: build perf via CORE_IMAGE_EXTRA_INSTALL

Instead of adding perf to the target: list, add it to
CORE_IMAGE_EXTRA_INSTALL. This means that machine configurations which
need to change the target don't need to also build perf explicitly.

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>

ci/base.yml

@@ -40,9 +40,9 @@ local_conf_header:
     DISTRO_FEATURES:remove = "ptest"
   kvm: |
     QEMU_USE_KVM = ""
-
+  perf: |
+    CORE_IMAGE_EXTRA_INSTALL += "perf"
 machine: unset
 
 target:
   - core-image-base
-  - perf

ci/gem5-arm64.yml

@@ -13,5 +13,4 @@ machine: gem5-arm64
 
 target:
   - core-image-minimal
-  - perf
   - gem5-aarch64-native

ci/qemu-generic-arm64.yml

@@ -11,5 +11,4 @@ machine: qemu-generic-arm64
 
 target:
   - core-image-base
-  - perf
   - sbsa-acs

ci/qemuarm64-secureboot.yml

@@ -12,7 +12,6 @@ local_conf_header:
 
 target:
   - core-image-base
-  - perf
   - optee-examples
   - optee-test
   - optee-spdevkit

ci/tc0.yml

@@ -7,4 +7,3 @@ machine: tc0
 
 target:
   - tc-artifacts-image
-  - perf

ci/tc1.yml

@@ -7,4 +7,3 @@ machine: tc1
 
 target:
   - tc-artifacts-image
-  - perf