Remove M_USE_RESERVE from the devfs cdp allocator, which is one of two uses of M_USE_RESERVE in the kernel. This allocation is not special.
Remove M_USE_RESERVE from the devfs cdp allocator, which is one of two
uses of M_USE_RESERVE in the kernel. This allocation is not special.

Reviewed by:	alc
Tested by:	pho
MFC after:	2 weeks

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