tests: stack_unwind/x86: no need to force no optimizations

Previously, forcing no compiler optimizations is required for
x86_64 to unwind stack. However, this is not the case anymore
as long as frame pointers are not omitted. So update custom
kconfigs for x86 in the stack_unwind test.

Signed-off-by: Daniel Leung <[email protected]>

Author: dcpleung

tests/arch/common/stack_unwind/testcase.yaml

@@ -33,8 +33,8 @@ tests:
   arch.common.stack_unwind.x86:
     arch_allow: x86
     extra_configs:
-      - CONFIG_NO_OPTIMIZATIONS=y
       - CONFIG_OMIT_FRAME_POINTER=n
+      - CONFIG_OVERRIDE_FRAME_POINTER_DEFAULT=y
     integration_platforms:
       - qemu_x86
       - qemu_x86_64