missing require target has_arch_ppc64 for pr106550.c

missing require target has_arch_ppc64 for pr106550.c

Hi,

Case pr106550.c is testing constant building for 64bit
register. It fails with -m32 without having the expected rldimi.
So, this case requires target of has_arch_ppc64.

Bootstrap and regtest pass on ppc64{,le}.
Is this ok for trunk?

BR,
Jeff(Jiufu) Guo

gcc/testsuite/ChangeLog:

	* gcc.target/powerpc/pr106550.c: Adjust by requiring has_arch_ppc64
	effective target. And remove power10_ok.