linuxkpi: Call `lkpi_fpu_safe_exec()` in the implementation of kvmalloc()HEADmain

`kvmalloc()` was a simple wrapper around the FreeBSD native `malloc()`.
Unlike the more involved implementation of `kmalloc()`, it didn't end
and being the FPU context around the actual call to `malloc()`.

This caused the following panic in the amdgup DRM driver:

    panic: malloc: called with spinlock or critical section held

... triggered by the call:

    struct dc_3dlut *lut = kvzalloc(sizeof(*lut), GFP_KERNEL);

(for the record, GFP_KERNEL is defined as M_WAITOK)

Replicating the same behaviour as `kmalloc()`, in other words, ending
the FPU context before the call to the underlying `malloc()`, and
beginning it again afterwards solves the problem.

Reviewed by:	olce
Sponsored by:	The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D51557

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