Revert "lmbench: fix build for xtensa"

This reverts commit 7c04932603476f3adf474f3bc47c35bdb59d947a.
Now that -mtext-section-literals is specified in the xtensa ABI this fix
is no longer needed.

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

package/lmbench/lmbench.mk

@@ -19,10 +19,6 @@ LMBENCH_CFLAGS += -I$(STAGING_DIR)/usr/include/tirpc/
 LMBENCH_LDFLAGS += -ltirpc
 endif
 
-ifeq ($(BR2_xtensa),y)
-LMBENCH_CFLAGS += -mtext-section-literals
-endif
-
 define LMBENCH_CONFIGURE_CMDS
 	$(call CONFIG_UPDATE,$(@D))
 	sed -i 's/CFLAGS=/CFLAGS+=/g' $(@D)/src/Makefile