soc: espressif: esp32s2: simple boot support

Add simplistic booting method which allows to run
applications without the 2nd stage bootloader.

- introduce memory layout header file
- update and optimize default and mcuboot linker scripts
- remove building multiple binaries during the application build

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