Ext flash erase

[jaenrig-ifx]

By creating this pull request you agree to the terms in CONTRIBUTING.md.
https://github.com/Infineon/.github/blob/master/CONTRIBUTING.md
--- DO NOT DELETE ANYTHING ABOVE THIS LINE ---

CONTRIBUTING.md also tells you what to expect in the PR process.

Description

• Added command to erase external flash.
• Added the openocd bsp configuration to flashing process. This could resolve the issues with new boards. If that is the case, we can delete the stage of flashing the hello-world. But first needs testing.

[github-actions]

Code size report:

   bare-arm:    +0 +0.000% 
minimal x86:    +0 +0.000% 
   unix x64:    +0 +0.000% standard
      stm32:    +0 +0.000% PYBV10
     mimxrt:    +0 +0.000% TEENSY40
        rp2:    +0 +0.000% PICO
       samd:    +0 +0.000% ADAFRUIT_ITSYBITSY_M4_EXPRESS

[IFX-Anusha]

This works!! Could recover the board with device-erase 🔥