kexec_file: Allow archs to handle special regions while locating memory hole

Some architectures may have special memory regions, within the given
memory range, which can't be used for the buffer in a kexec segment.
Implement weak arch_kexec_locate_mem_hole() definition which arch code
may override, to take care of special regions, while trying to locate
a memory hole.

Also, add the missing declarations for arch overridable functions and
and drop the __weak descriptors in the declarations to avoid non-weak
definitions from becoming weak.

Signed-off-by: Hari Bathini <[email protected]>
Tested-by: Pingfan Liu <[email protected]>
Reviewed-by: Thiago Jung Bauermann <[email protected]>
Acked-by: Dave Young <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://lore.kernel.org/r/159602273603.575379.17665852963340380839.stgit@hbathini

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