arch: arm: Allow enabling FPU hard ABI with TF-M
arch: arm: Allow enabling FPU hard ABI with TF-M

Allow enabling FPU with TF-M with the following limitations:
- Only IPC mode is supported by TF-M.
- Disallow FPU hard ABI when building the NS application, the TF-M build
system does not pass the flags correctly to all dependencies.

Signed-off-by: Joakim Andersson <cf0fcab5d38d6e132e92a97bcb0bae257abf4936@nordicsemi.no>

zephyrproject-rtos/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,finikorg/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr