modules: tf-m: keep building with Mbed TLS 3.6.5

This is temporary as TF-M is supposed to jump to TF-PSA-Crypto soon.
However since also Zephyr is transitioning to Mbed TLS/TF-PSA-Crypto right
now, it's better to limit to number of simultaneous changes, so for the
time keep TF-M relying on Mbed TLS 3.6.5.

In order to keep building with Mbed TLS 3.6.5 the previous configuration
header file is resumed and renamed appropriately.

Signed-off-by: Valerio Setti <vsetti@baylibre.com>

Author: valeriosetti