uboot-imx

km8309: change the default QE_FW address

It should be after the u-boot reserved sectors and before the env
sectors, since the solution used for kmvect1 (tell the linker to put the
firmware into the u-boot produced binary, at the end of the area) should
be the exception.

The #define is only "conditional" so that we can still support kmvect1.

Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com>