soc: espressif: esp32s2: improve memory layout

- Allow more statical allocations by reordering the sections
  in the mcuboot.ld and in default.ld.
- Reorder the ROM sections to cover the cases described in
  the `common-rom-common-kernel-devices.ld`.
  Changing the order of .rodata and .text we prevents to create an
  overlapped segments issue.

Signed-off-by: Marek Matej <marek.matej@espressif.com>