Revert "kmod: disable --gc-sections ld option when building for xtensa"

This reverts commit 55c83179c4b30c9ec715a75297849abd74a63e05.
Now that binutils bug with --gc-section is fixed this workaroud is no
longer needed.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/kmod/kmod.mk

@@ -39,11 +39,6 @@ KMOD_DEPENDENCIES += $(if $(BR2_PACKAGE_PYTHON),python,python3)
 KMOD_CONF_OPTS += --enable-python
 endif
 
-# --gc-sections triggers a bug in the current Xtensa binutils
-ifeq ($(BR2_xtensa),y)
-KMOD_CONF_ENV += cc_cv_LDFLAGS__Wl___gc_sections=no
-endif
-
 ifeq ($(BR2_PACKAGE_KMOD_TOOLS),y)
 
 # add license info for kmod tools