Build: Deprecate TFM_SYSTEM_FP in ARMCLANG & IAR toolchains

Currently FP in TFM is only supported by GCC. The only purpose of
FP related config 'TFM_SYSTEM_FP' in ARMCLANG & IAR toolchains is
to set compiler flags for the time being.
To avoid any confusion, this config needs to be deprecated.

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: I3c310fa19a709aa714374b4e6e762c38dee9e1b7
2 files changed