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x86/clear_page: add clear_page_uncached()
Define clear_page_uncached() as an alternative_call() to clear_page_nt() if the CPU sets X86_FEATURE_NT_GOOD and fallback to clear_page() if it doesn't. Similarly define clear_page_uncached_flush() which provides an SFENCE if the CPU sets X86_FEATURE_NT_GOOD. Also, add the glue interface clear_user_highpage_uncached(). Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
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