i386: Use ix86_output_ssemov for SFmode TYPE_SSEMOV

i386: Use ix86_output_ssemov for SFmode TYPE_SSEMOV

There is no need to set mode attribute to V16SFmode since ix86_output_ssemov
can properly encode xmm16-xmm31 registers with and without AVX512VL.

gcc/

	PR target/89229
	* config/i386/i386.c (ix86_output_ssemov): Handle MODE_SI and
	MODE_SF.
	* config/i386/i386.md (*movsf_internal): Call ix86_output_ssemov
	for TYPE_SSEMOV.  Remove TARGET_PREFER_AVX256, TARGET_AVX512VL
	and ext_sse_reg_operand check.

gcc/testsuite/

	PR target/89229
	* gcc.target/i386/pr89229-6a.c: New test.
	* gcc.target/i386/pr89229-6b.c: Likewise.
	* gcc.target/i386/pr89229-6c.c: Likewise.