allocate space in DRAM in spatial code example

Example: allocate space in DRAM in spatial

val dram1D        = DRAM[Int](64)
val dram1D_longer = DRAM[Int](1024)
val dram2D        = DRAM[Int](64,64)
val dram5D        = DRAM[Int](2,2,2,2,16)