Add missing TLSLE relocations for gold aarch64 backend.

Add missing TLSLE relocations for gold aarch64 backend.

gold/ChangeLog:
	* aarch64-reloc.def (TLSLE_MOVW_TPREL_G2, TLSLE_MOVW_TPREL_G1,
	TLSLE_MOVW_TPREL_G1_NC, TLSLE_MOVW_TPREL_G0, TLSLE_MOVW_TPREL_G0_NC,):
	New relocation.
	* aarch64.cc (Target_aarch64::Scan::local): Add cases for new
	TLSLE_MOVW_* relocations.
	(Target_aarch64::Scan::global): Likewise.
	(Target_aarch64::Relocate::relocate): Likewise.
	(Target_aarch64::Relocate::relocate_tls): Add cases and handlings
	for new TLSLE_MOVW_* relocations.