Remove unused generic/armv7-a-neon ARCH_ARM_HAVE_TLS_REGISTER.

Change-Id: I84b1d43acf220b7adedb36bf98c9fd82d86abd7a
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 5338dcb..80a34cc 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -13,7 +13,6 @@
 TARGET_CPU_ABI := armeabi-v7a
 TARGET_CPU_ABI2 := armeabi
 TARGET_CPU_SMP := true
-ARCH_ARM_HAVE_TLS_REGISTER := true
 
 SMALLER_FONT_FOOTPRINT := true
 MINIMAL_FONT_FOOTPRINT := true