tile: remove DEBUG_EXTRA_FLAGS kernel config option

It isn't used any more by us now that the generic kernel build
offers DEBUG_INFO_REDUCED, so just get rid of it.
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

arch/tile/Kconfig.debug

@@ -14,16 +14,6 @@ config EARLY_PRINTK
 	  with klogd/syslogd. You should normally N here,
 	  unless you want to debug such a crash.
 
-config DEBUG_EXTRA_FLAGS
-	string "Additional compiler arguments when building with '-g'"
-	depends on DEBUG_INFO
-	default ""
-	help
-	  Debug info can be large, and flags like
-	  `-femit-struct-debug-baseonly' can reduce the kernel file
-	  size and build time noticeably.  Such flags are often
-	  helpful if the main use of debug info is line number info.
-
 config TILE_HVGLUE_TRACE
 	bool "Provide wrapper functions for hypervisor ABI calls"
 	default n

arch/tile/Makefile

@@ -30,10 +30,6 @@ endif
 # In kernel modules, this causes load failures due to unsupported relocations.
 KBUILD_CFLAGS   += -fno-asynchronous-unwind-tables
 
-ifneq ($(CONFIG_DEBUG_EXTRA_FLAGS),"")
-KBUILD_CFLAGS   += $(CONFIG_DEBUG_EXTRA_FLAGS)
-endif
-
 LIBGCC_PATH     := \
   $(shell $(CC) $(KBUILD_CFLAGS) $(KCFLAGS) -print-libgcc-file-name)