add new heepsilon_mcu_gen.hjson file

[NicCarp11]

No description provided.

[NicCarp11]

To fix SW, look at esl-epfl/x-heep#399

Meanwhile, add this to the linker script to use interleaved data

This PR can already be merged, but it won't leverage interleaved banks

.data_interleaved :
 {
   . = ALIGN(4);
   *(.xheep_data_interleaved)
   . = ALIGN(4);
 } >ram_il