Merge branch 'bugfix/dram_attr' into 'master'

fix DRAM_ATTR attribute

Variables marked with DRAM_ATTR were not placed in any specific section and were appended to the last section, causing some errors at binary file generation stage.
This change places contents of .dram1 section into .dram0.data.
Also removes .iram1pro/.iram1app/.dram1pro/.dram1app which weren't used anywhere.

See merge request !23