parisc: decompressor: remove repeated depenency of misc.o

The same dependency

    $(obj)/misc.o: $(obj)/sizes.h

... appears twice, at line 29 and line 55 in this Makefile.

Remove the second one.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Helge Deller <deller@gmx.de>