testsuite: arm: fix arm_movt cut&pasto

testsuite: arm: fix arm_movt cut&pasto

I got spurious fails of tests that required arm_thumb1_movt_ok on a
target cpu that did not support movt.  Looking into it, I found the
arm_movt property to have been cut&pasted into other procs that
checked for different properties.  They shouldn't share the same test
results cache entry, so I'm changing their prop names.  Or rather its
prop name, because the other occurrence was already fixed recently.

for  gcc/testsuite/ChangeLog

	* lib/target-supports.exp
	(check_effective_target_arm_thumb1_cbz_ok): Fix prop name
	cut&pasto.