efi/capsule: Replace kmap_atomic() with kmap_local_page()

kmap_atomic() is deprecated in favour of kmap_local_page(), as described
in Documentation/mm/highmem.rst.

The conversion is safe here: the mapping is created and torn down within a
single iteration of the sg_count loop, preserving the strict stack-based
ordering that kmap_local_page() requires, and the mapped region is only
written to, so neither pagefault_disable() nor preempt_disable() is needed.
The surrounding code already sleeps (it allocates the pages with
alloc_page(GFP_KERNEL) and later takes capsule_mutex), so there is no
atomic context to preserve.

Build-tested only.

Assisted-by: LLM sparse
Signed-off-by: Danish Khateeb <danishkhateeb03@gmail.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

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