arch: make the max stack frames configurable

Current on x86 & risc-v that implement stack trace, the
maximum depth of the stack trace is defined by a macro.

Introduce a new Kconfig:EXCEPTION_STACK_TRACE_MAX_FRAMES
so that this is configurable in software.

Signed-off-by: Yong Cong Sin <ycsin@meta.com>

arch/riscv/core/stacktrace.c

@@ -20,7 +20,7 @@ uintptr_t z_riscv_get_sp_before_exc(const z_arch_esf_t *esf);
  #define PR_REG "%016" PRIxPTR
 #endif
 
-#define MAX_STACK_FRAMES 8
+#define MAX_STACK_FRAMES CONFIG_EXCEPTION_STACK_TRACE_MAX_FRAMES
 
 struct stackframe {
 	uintptr_t fp;

arch/x86/core/fatal.c

@@ -140,7 +140,7 @@ struct stack_frame {
 #endif
 };
 
-#define MAX_STACK_FRAMES 8
+#define MAX_STACK_FRAMES CONFIG_EXCEPTION_STACK_TRACE_MAX_FRAMES
 
 __pinned_func
 static void unwind_stack(uintptr_t base_ptr, uint16_t cs)

subsys/debug/Kconfig

@@ -389,6 +389,14 @@ config EXCEPTION_STACK_TRACE
 	  print a stack trace of function memory addresses when an
 	  exception is reported.
 
+config EXCEPTION_STACK_TRACE_MAX_FRAMES
+	int "Configures the depth of stack trace"
+	default 8
+	depends on EXCEPTION_STACK_TRACE
+	help
+	  In the event of a stack trace, this place a limit on the depths
+	  of the stack to examine.
+
 config EXCEPTION_STACK_TRACE_SYMTAB
 	bool "Print function names in the stack trace"
 	select SYMTAB