tests: coredump: no need for special xtensa entry

We use the same code flow now on all architectures, so no need for a
special entry for xtensa.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

tests/subsys/debug/coredump/testcase.yaml

@@ -7,7 +7,6 @@ tests:
     platform_exclude: acrn_ehl_crb
     arch_exclude:
       - posix
-      - xtensa
     integration_platforms:
       - qemu_x86
     harness: console
@@ -23,26 +22,3 @@ tests:
         - "E: #CD:4([dD])([0-9a-fA-F]+)"
         - "E: #CD:END#"
         - "k_sys_fatal_error_handler"
-
-  debug.coredump.logging_backend_xtensa:
-    tags: coredump
-    ignore_faults: true
-    ignore_qemu_crash: true
-    filter: CONFIG_ARCH_SUPPORTS_COREDUMP
-    arch_allow:
-      - xtensa
-    integration_platforms:
-      - qemu_xtensa
-    harness: console
-    harness_config:
-      type: multi_line
-      regex:
-        - "Coredump: (.*)"
-        - "E: #CD:BEGIN#"
-        - "E: #CD:5([aA])45([0-9a-fA-F]+)"
-        - "E: #CD:41([0-9a-fA-F]+)"
-        - "E: #CD:4([dD])([0-9a-fA-F]+)"
-        - "E: #CD:4([dD])([0-9a-fA-F]+)"
-        - "E: #CD:END#"
-        - ">>> ZEPHYR FATAL ERROR "
-        - "k_sys_fatal_error_handler"