testing/nand_sim: Adds a virtual NAND Flash device

[resyfer]

Adds NAND Flash device in simulator
Fixes echo in terminal for Vi

Summary

• Adds a NAND Flash virtual device for the simulator.
• Removes echo of commands in vi (especially during movement), and double echo of characters in command line in vi due to the same reason.

Impact

• NAND flash compatible file systems can test using this.
• Makes vi more usable

Testing

• Basic file system operations after mounting using littlefs.
• checkpatch.sh (An error that nxstyle gives, which looks to be a genuine error, is /nuttxspace/apps/testing/nand_sim/nand_sim_main.c:103:44: error: Multiple data definitions which might be in this issue).

[acassis]

@xiaoxiang781216 @resyfer why the CI is failing? Should Saurav rebase it to force the CI to pass?

[resyfer]

@acassis Hi! Sorry for the late reply. I've done a force push.

What I don't understand is this line from the error (and subsequent lines similar to it):

/github/workspace/sources/apps/testing/nand_sim/Kconfig:34: 'endif' in different file than 'if'

I have them:

6  | config TESTING_NAND_SIM
...
12 | if TESTING_NAND_SIM
...
34 | endif

I had tried force pushing earlier after rebasing, but it still showed this CI error.

[resyfer]

@acassis @xiaoxiang781216 Hi, can you please approve this PR for CI testing? Thank you!

[acassis]

Hi @resyfer sorry I missed your message. I don't look nuttx-apps so often as I do for nuttx kernel. I hope now it works fine

[resyfer]

Hi @acassis no worries! Thanks for the approval. It also looks like the CI tests have completed finally.

[resyfer]

Thank you for the review!