Enable TLS register by default for ARMv7a arch

Everything that is based on ARMv7a should have a cp15 TLS register.
Enable it by default so it's not accidentally missed in newer board
configurations. In fact, this could be enabled for ARMv6 as well, but we
currently don't distinguish between ARMv5 and ARMv6 in the build system.

This can still be disabled by setting it to "false" in the board
configuration, but this shouldn't ever be needed.

Change-Id: Ic2918f32899c8bcfa482f92c98f5a192fa318470
diff --git a/core/combo/arch/arm/armv7-a-neon.mk b/core/combo/arch/arm/armv7-a-neon.mk
index 7b5b8ed..32273ff 100644
--- a/core/combo/arch/arm/armv7-a-neon.mk
+++ b/core/combo/arch/arm/armv7-a-neon.mk
@@ -8,6 +8,7 @@
 ARCH_ARM_HAVE_CLZ               := true
 ARCH_ARM_HAVE_FFS               := true
 ARCH_ARM_HAVE_ARMV7A            := true
+ARCH_ARM_HAVE_TLS_REGISTER      := true
 ARCH_ARM_HAVE_VFP               := true
 ARCH_ARM_HAVE_VFP_D32           := true
 ARCH_ARM_HAVE_NEON              := true
diff --git a/core/combo/arch/arm/armv7-a.mk b/core/combo/arch/arm/armv7-a.mk
index 0ca3ec6..220f7ec 100644
--- a/core/combo/arch/arm/armv7-a.mk
+++ b/core/combo/arch/arm/armv7-a.mk
@@ -8,6 +8,7 @@
 ARCH_ARM_HAVE_CLZ               := true
 ARCH_ARM_HAVE_FFS               := true
 ARCH_ARM_HAVE_ARMV7A            := true
+ARCH_ARM_HAVE_TLS_REGISTER      := true
 ARCH_ARM_HAVE_VFP               := true
 
 # Note: Hard coding the 'tune' value here is probably not ideal,