northbridge/amd/amdmct: Fix FTBFS with node interleaving enabled

This fixes errors of the form:
error: 'Dct0MemSize' may be used uninitialized in this function

Change-Id: Ifc853aea9050994f5641c57a081aa0667331c995
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-on: http://review.coreboot.org/8455
Tested-by: build bot (Jenkins)
2 files changed