[AArch64 disassembler] Add missing checks of undefined encodings on
st1/st2/st3/st4 instructions.

opcodes/

	* aarch64-dis.c (aarch64_ext_ldst_elemlist): Check H/S undefined
	instructions.

binutils/testsuite/

	* binutils-all/aarch64/aarch64.exp: New test driver for AArch64.
	* binutils-all/aarch64/unallocated-encoding.s: New testcase.
	* binutils-all/aarch64/unallocated-encoding.d: Ditto.
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