Build: Fix IAR build

* Use --fpu none instead of --fpu=none
  IAR ASM compiler does not recognize --fpu=none
* Add missing CONFIG_TFM_FP ifdef
* IAR using different ARCH defines, than ARMCLANG or GCC,
  modified ARCH defines in secure IAR linker
* Fix location pragma typo in ns_agent_tz

Signed-off-by: Dávid Házi <david.hazi@arm.com>
Change-Id: I2904deb3ae896895c8bc6a4fc119707c1df979e6
3 files changed