compile/opt: add config DEBUG_LINK_MAP

Selecting this option will pass "-Map=$(TOPDIR)$(DELIM)nuttx.map" to ld
when linking NuttX ELF. That file can be useful for verifying
and debugging magic section games, and for seeing which
pieces of code get eliminated with DEBUG_OPT_UNUSED_SECTIONS.

Signed-off-by: chao.an <anchao@xiaomi.com>

boards/xtensa/esp32s3/esp32s3-devkit/scripts/Make.defs

@@ -64,7 +64,6 @@ CXXELFFLAGS = $(CXXFLAGS) -mtext-section-literals
 LDELFFLAGS = -r -e main
 LDELFFLAGS += -T $(call CONVERT_PATH,$(BOARD_DIR)$(DELIM)scripts$(DELIM)gnu-elf.ld)
 
-LDFLAGS += -Map=$(call CONVERT_PATH,$(TOPDIR)/nuttx.map) --cref
 ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
   LDFLAGS += -g
 endif