powerpc/code-patching: Add data patch alignment check

The new data patching still needs to be aligned within a
cacheline too for the flushes to work correctly. To simplify
this requirement, we just say data patches must be aligned.

Detect when data patching is not aligned, returning an invalid
argument error.

Signed-off-by: Benjamin Gray <[email protected]>
Reviewed-by: Hari Bathini <[email protected]>
Acked-by: Naveen N Rao <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://msgid.link/[email protected]

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