powerpc/fadump: remove dependency with CONFIG_KEXEC

powerpc/fadump: remove dependency with CONFIG_KEXEC

Now that crashkernel parameter parsing and vmcoreinfo related code is
moved under CONFIG_CRASH_CORE instead of CONFIG_KEXEC_CORE, remove
dependency with CONFIG_KEXEC for CONFIG_FA_DUMP.  While here, get rid of
definitions of fadump_append_elf_note() & fadump_final_note() functions
to reuse similar functions compiled under CONFIG_CRASH_CORE.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Hari Bathini <[email protected]>
Reviewed-by: Mahesh Salgaonkar <[email protected]>
Acked-by: Michael Ellerman <[email protected]>
Cc: Fenghua Yu <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: Dave Young <[email protected]>
Cc: Eric Biederman <[email protected]>
Cc: Vivek Goyal <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>