powerpc: Check only single values are passed to CPU/MMU feature checks

cpu_has_feature()/mmu_has_feature() are only able to check a single
feature at a time, but there is no enforcement of that.

In fact, as fixed in the previous commit, there was code that was
passing multiple values to cpu_has_feature().

So add a check that only a single feature is passed using popcount.

Note that the test allows 0 or 1 bits to be set, because some code
relies on cpu_has_feature(0) being false, the check with
CPU_FTRS_POSSIBLE ensures that. See for example CPU_FTR_PPC_LE.

Signed-off-by: Michael Ellerman <[email protected]>
Link: https://msgid.link/[email protected]

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