mm/memory-failure.c: replace "MCE" with "Memory failure"

HWPoison was specific to some particular x86 platforms.  And it is often
seen as high level machine check handler.  And therefore, 'MCE' is used
for the format prefix of printk().  However, 'PowerNV' has also used
HWPoison for handling memory errors[1], so 'MCE' is no longer suitable
to memory_failure.c.

Additionally, 'MCE' and 'Memory failure' have different context.  The
former belongs to exception context and the latter belongs to process
context.  Furthermore, HWPoison can also be used for off-lining those
sub-health pages that do not trigger any machine check exception.

This patch aims to replace 'MCE' with a more appropriate prefix.

[1] commit 75eb3d9b60c2 ("powerpc/powernv: Get FSP memory errors
and plumb into memory poison infrastructure.")

Signed-off-by: Chen Yucong <slaoub@gmail.com>
Acked-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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