testsuite: Remove test for arm32 in arm_soft_ok

testsuite: Remove test for arm32 in arm_soft_ok

There is no reason to check for arm32 when checking for
-mfloat=abi-soft support. Instead this implies skipping some tests
when targetting a thumb-1 cpu, while they pass.

This patch removes the arm32 check, and uses the same skeleton as
arm_softfp_ok and arm_hard_ok.

2020-08-20  Christophe Lyon  <christophe.lyon@linaro.org>

	gcc/testsuite/
	* lib/target-supports.exp (arm_soft_ok): Remove arm32 check.