aarch64: Restrict SME_LUTv2 instructions to streaming mode

These instruction definitions were incorrectly missing their streaming
mode requirement.

gcc/ChangeLog:

	* config/aarch64/aarch64-sme.md
	(aarch64_sme_write_zt): Add TARGET_STREAMING requirement.
	(aarch64_sme_lut_zt): Ditto.
1 file changed