ARM: 9076/1: boot: remove redundant piggy_data from clean-files
Kbuild cleans up files listed in 'targets'.
'piggy_data' is already added to 'targets' a few lines above.
Adding it to 'clean-files' is redundant.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
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