[testsuite] [arm] adjust wmul expectations [PR113560]

[testsuite] [arm] adjust wmul expectations [PR113560]

Since the machine-independent widening multiply logic was improved
PR113560, ARM's wmul-[567].c fail.  AFAICT the logic takes advantage
of the fact that, after zero-extending a narrow integral type to a
wider type, further zero- or sign-extending is equivalent, which
enables different instructions to be used for equivalent effect.

Adjust the tests to accept all the equivalent instructions that can be
used.

for  gcc/testsuite/ChangeLog

	PR target/113560
	* gcc.target/arm/wmul-5.c: Accept other mla instructions.
	* gcc.target/arm/wmul-6.c: Likewise.
	* gcc.target/arm/wmul-7.c: Likewise.