arm: fsl: Adjust ordering of #ifndef CONFIG_SPL_BUILD

The secure boot header files incorrectly define SPL options only if
CONFIG_SPL_BUILD is defined. This means that the options are only enabled
in an SPL build, and not with a normal 'make xxx_defconfig'. This means
that moveconfig.py cannot work, since it sees the options as disabled even
when they may be manually enabled in an SPL build.

Fix this by changing the order.

Signed-off-by: Simon Glass <sjg@chromium.org>