ARM: 8539/1: decompressor: drop more unneeded assignments to "targets"

The objects "font.o" and "misc.o" are contained in $(OBJS), and it
is already added to the "targets".

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>