*native_posix* driver name renaming

[aescolar]

We have quite a few drivers with native_posix in their name, DTS and/or kconfig options and file names.
Now that native_posix is being removed we have two options: We let them be, or we rename them
following appropriate deprecation.
Letting them be as they are could be a bit confusing for users, but minimizes churn, and viceversa.
We also don't necessarily need to rename all.

Possible renaming:

• native_sim board specific drivers:
  • native_posix_timer => native_sim_timer
    • CONFIG_NATIVE_POSIX_TIMER => CONFIG_NATIVE_SIM_TIMER
  • counter_native_posix => counter_native_sim
• native simulator specific (can be used in all current POSIX arch targets):
  • fake_entropy_native_posix => fake_entropy_native_sim
    • zephyr_native_posix_rng => zephyr_native_sim_rng
    • CONFIG_FAKE_ENTROPY_NATIVE_POSIX => CONFIG_FAKE_ENTROPY_NATIVE_SIM
  • CONFIG_UART_NATIVE_POSIX => CONFIG_UART_NATIVE_PTTY
  • CONFIG_ETH_NATIVE_POSIX => CONFIG_ETH_NATIVE_TUN_TAP ?
• For any posix arch target:
  • log_backend_native_posix => log_backend_native ?
  • usb_native_posix ?
• DTS zephyr,native-posix-cpu => zephyr,native-sim-cpu ?

[aescolar]

@jukkar @rlubos @nordic-krch @ceolin @jfischer-no @tmon-nordic @dcpleung , input is welcome

[tmon-nordic]

USB_NATIVE_POSIX will be depreated alongside the old USB stack. The implementation is completely wrong. The new stack has better USBIP support which does not share the USB_NATIVE_POSIX problems (including, but not limited to confusing name).

[jukkar]

No objection for changing native_posix -> native_sim in Ethernet driver. The driver has not seen much changes lately so I am not expecting merge issues in the future. Renaming Kconfig options is of course a bigger change that might affect users but I suppose that is unavoidable.

[ceolin]

@aescolar No objections on my side for the entropy as well :)

[dcpleung]

CONFIG_UART_NATIVE_PTTY is better since the source file is named uart_native_ptty.c already.