powerpc/t2080qds: undef CONFIG_FSL_DDR_INTERACTIVE

Usually CONFIG_FSL_DDR_INTERACTIVE feature is used for debug.
we would not enable this by default to save the limited space of u-boot.

This avoid following compiling error:
section .bootpg loaded at [00000000effff000,00000000effff577] overlap ssection
.data loaded at [00000000efff31b8,00000000f00010c7]
u-boot: section .bootpg lma 0xeffff000 adjusted to 0xf00010c8

Signed-off-by: Shengzhou Liu <Shengzhou.Liu@freescale.com>
Acked-by: York Sun <yorksun@freescale.com>