nommu: Select TLS register emulation if ARMv6 and not v6K

If not MMU and not v6K, access to the TLS register has to be
emulated. MMU-less systems do not provide a high page for kuser
helpers.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

arch/arm/mm/Kconfig

@@ -421,6 +421,7 @@ config CPU_32v5
 
 config CPU_32v6
 	bool
+	select TLS_REG_EMUL if !CPU_32v6K && !MMU
 
 config CPU_32v7
 	bool