[TF-M] FIH code sharing

Hi,

Currently TF-M and mcuboot have some "common" FIH code (see for example commit 0a74c1ea8a0c0783a2914d87cd2e88b677718a2e that copied fih.{c|h} from mcuboot. There are also multiple copies of fih.h within the TF-M repo (lib/fih/inc and bl2/ext/mcuboot/include).

Are there any plans to avoid having copies of that code? Maybe to split the FIH library into its own repo that can be used by both TF-M and mcuboot?

Thanks,

Chris