Fix fma test case [PR97018]

Fix fma test case [PR97018]

These tests are written for 256 bit vector. For -march=cascadelake,
vector size changed to 512 bit. It doubles the number of fma
instruction and test fail. Fix is to explicitly disable 512 bit
vector by passing additional option -mno-avx512f.

Tested on x86-64.

gcc/testsuite/ChangeLog:

	PR target/97018
	* gcc.target/i386/l_fma_double_1.c: Add option -mno-avx512f.
	* gcc.target/i386/l_fma_double_2.c: Likewise.
	* gcc.target/i386/l_fma_double_3.c: Likewise.
	* gcc.target/i386/l_fma_double_4.c: Likewise.
	* gcc.target/i386/l_fma_double_5.c: Likewise.
	* gcc.target/i386/l_fma_double_6.c: Likewise.
	* gcc.target/i386/l_fma_float_1.c: Likewise.
	* gcc.target/i386/l_fma_float_2.c: Likewise.
	* gcc.target/i386/l_fma_float_3.c: Likewise.
	* gcc.target/i386/l_fma_float_4.c: Likewise.
	* gcc.target/i386/l_fma_float_5.c: Likewise.
	* gcc.target/i386/l_fma_float_6.c: Likewise.