x86: Define GNU_PROPERTY_X86_ISA_1_AVX512_BF16

x86: Define GNU_PROPERTY_X86_ISA_1_AVX512_BF16

Update assembler and readelf to support

 #define GNU_PROPERTY_X86_ISA_1_AVX512_BF16  (1U << 24)

for AVX512_BF16.

binutils/

	* readelf.c (decode_x86_isa): Handle
	GNU_PROPERTY_X86_ISA_1_AVX512_BF16.
	* testsuite/binutils-all/i386/pr21231b.d: Updated.
	* testsuite/binutils-all/x86-64/pr21231b.d: Likewise.

gas/

	* config/tc-i386.c (output_insn): Support
	GNU_PROPERTY_X86_ISA_1_AVX512_BF16.
	* testsuite/gas/i386/property-2.s: Add AVX512_BF16 test.
	* testsuite/gas/i386/property-2.d: Updated.
	* testsuite/gas/i386/x86-64-property-2.d: Likewise.

include/

	* elf/common.h (GNU_PROPERTY_X86_ISA_1_AVX512_BF16): New.