Remove unused samsung/tuna ARCH_ARM_HAVE_TLS_REGISTER.

Change-Id: I5d3b66a643bc456919983477c9b845edb8192fb6
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 1e6d96a..a04fafc 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -31,7 +31,6 @@
 TARGET_ARCH := arm
 TARGET_ARCH_VARIANT := armv7-a-neon
 TARGET_CPU_VARIANT := cortex-a9
-ARCH_ARM_HAVE_TLS_REGISTER := true
 
 TARGET_NO_BOOTLOADER := true