meta-ibm: minor append syntax fix
Yocto append syntax should use assignment only and not `+=`.
Adjust this to fix the warning:
```
WARNING: ... :append:p10bmc += is not a recommended operator
combination, please replace it.
```
Fixes 6b7c28775d91c65816b1716edefe4e3299e1aa50.
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I90ca66a4651b843e3fe96c13ba0242f7b6fca58d
diff --git a/meta-ibm/recipes-phosphor/settings/phosphor-settings-manager_%.bbappend b/meta-ibm/recipes-phosphor/settings/phosphor-settings-manager_%.bbappend
index 3e8f58c..85bdf54 100644
--- a/meta-ibm/recipes-phosphor/settings/phosphor-settings-manager_%.bbappend
+++ b/meta-ibm/recipes-phosphor/settings/phosphor-settings-manager_%.bbappend
@@ -5,5 +5,5 @@
SRC_URI:append = " file://ibm_settings.override.yml"
SRC_URI:append:p10bmc = " file://HypervisorInterface-default-p10bmc.override.yml"
SRC_URI:append:p10bmc = " file://TPMEnable-default-true.override.yml"
-SRC_URI:append:p10bmc += " file://BootMode-default-setup.override.yml"
+SRC_URI:append:p10bmc = " file://BootMode-default-setup.override.yml"
SRC_URI:append:witherspoon-tacoma = " file://HypervisorInterface-default-tacoma.override.yml"