Add support for SM-S918B-Oneui7 branch in workflow

.github/workflows/kernel-samsung.yml

@@ -145,6 +145,9 @@ jobs:
           - branch: "SM-S918B-Oneui8"
             android_version: "android13"
             kernel_version: "5.15"
+          - branch: "SM-S918B-Oneui7"
+            android_version: "android13"
+            kernel_version: "5.15"
             build_type: "Bazel"
           - branch: "SM-M146B-Oneui7-ADYJ2"
             android_version: "android13"