powerpc/kexec_file: Restore FDT size estimation for kdump kernel

kexec_fdt_totalsize_ppc64() includes the base FDT size in its size
calculation, but commit 3c985d31ad66 ("powerpc: Use common
of_kexec_alloc_and_setup_fdt()") changed the kexec code to use the
generic function of_kexec_alloc_and_setup_fdt() which already includes
the base FDT size. That change made the code overestimate the size a bit
by counting twice the space required for the kernel command line and
/chosen properties.

Therefore change kexec_fdt_totalsize_ppc64() to calculate just the extra
space needed by the kdump kernel, and change the function name so that it
better reflects what the function is now doing.

Signed-off-by: Thiago Jung Bauermann <[email protected]>
Reviewed-by: Lakshmi Ramasubramanian <[email protected]>
Reviewed-by: Hari Bathini <[email protected]>
Acked-by: Michael Ellerman <[email protected]>
[robh: reword commit msg as no longer a fix from merging to branches]
Signed-off-by: Rob Herring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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