Fix build issues cause by LDFLAGS_FINAL changes

Commit 6dc1eceb "Introduce a new linker flag LDFLAGS_FINAL" modified a
number of Makefiles in a way that broke out-of-tree builds.  The
problem was that $(nandobj) was used before it got defined.

Fix this.

Signed-off-by: Wolfgang Denk <wd@denx.de>
Signed-off-by: Scott Wood <scottwood@freescale.com>