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linuxkpi: Add bitmap_alloc and bitmap_free

Description

linuxkpi: Add bitmap_alloc and bitmap_free

This is a simple call to kmallock_array/kfree, therefore include linux/slab.h as
this is where the kmalloc_array/kfree definition is.

Sponsored-by: The FreeBSD Foundation
Reviewed by: hselsasky
Differential Revision: https://reviews.freebsd.org/D24794

Details