lib/scatterlist: cleanup macros into static inline functions
Convert the sg_is_chain(), sg_is_last() and sg_chain_ptr() macros
into static inline functions. There's no reason for these to be macros
and static inline are generally preferred these days.
Also introduce the SG_PAGE_LINK_MASK define so the P2PDMA work, which is
adding another bit to this mask, can do so more easily.
Suggested-by: Jason Gunthorpe <jgg@nvidia.com> Signed-off-by: Logan Gunthorpe <logang@deltatee.com> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Signed-off-by: Christoph Hellwig <hch@lst.de>