Remove unused asus/grouper ARCH_ARM_HAVE_TLS_REGISTER.

Change-Id: I5165185b7fb36a78a734402c639857f4b7a81ef1

BoardConfigCommon.mk

diff --git a/BoardConfigCommon.mk b/BoardConfigCommon.mk
index be98635..e99f2d1 100644
--- a/BoardConfigCommon.mk
+++ b/BoardConfigCommon.mk
@@ -35,7 +35,6 @@
 TARGET_ARCH := arm
 TARGET_ARCH_VARIANT := armv7-a-neon
 TARGET_CPU_VARIANT := cortex-a9
-ARCH_ARM_HAVE_TLS_REGISTER := true
 
 TARGET_USERIMAGES_USE_EXT4 := true