xz: cleanup CRC32 edits from 2018

In 2018, a dependency on <linux/crc32poly.h> was added to avoid
duplicating the same constant in multiple files.  Two months later it was
found to be a bad idea and the definition of CRC32_POLY_LE macro was moved
into xz_private.h to avoid including <linux/crc32poly.h>.

xz_private.h is a wrong place for it too.  Revert back to the upstream
version which has the poly in xz_crc32_init() in xz_crc32.c.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: faa16bc404d7 ("lib: Use existing define with polynomial")
Fixes: 242cdad873a7 ("lib/xz: Put CRC32_POLY_LE in xz_private.h")
Signed-off-by: Lasse Collin <[email protected]>
Reviewed-by: Sam James <[email protected]>
Tested-by: Michael Ellerman <[email protected]> (powerpc)
Cc: Krzysztof Kozlowski <[email protected]>
Cc: Herbert Xu <[email protected]>
Cc: Joel Stanley <[email protected]>
Cc: Albert Ou <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Emil Renner Berthing <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Jubin Zhong <[email protected]>
Cc: Jules Maselbas <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: Paul Walmsley <[email protected]>
Cc: Randy Dunlap <[email protected]>
Cc: Rui Li <[email protected]>
Cc: Simon Glass <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Will Deacon <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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