debug: remove PRINTK from EXCEPTION_STACK_TRACE

The `PRINTK` was required for `EXCEPTION_STACK_TRACE` because
it's initial implementation for x86 in #6653 uses `printk()`.
We are using `LOG_ERR()` now, so this is not required anymore.

Signed-off-by: Yong Cong Sin <ycsin@meta.com>
diff --git a/subsys/debug/Kconfig b/subsys/debug/Kconfig
index cd93032..40eb73b 100644
--- a/subsys/debug/Kconfig
+++ b/subsys/debug/Kconfig
@@ -382,7 +382,6 @@
 config EXCEPTION_STACK_TRACE
 	bool "Attempt to print stack traces upon exceptions"
 	default y
-	depends on PRINTK
 	depends on DEBUG_INFO
 	depends on !OMIT_FRAME_POINTER
 	help