Docs: Define tfm_hal_status_t as enum in HAL

TF-M coding style avoids 'typedef' usage for non-function types.
Define 'tfm_hal_status_t' as enum type in HAL.

Change-Id: Idcd0f35c842030e1a42a1ea57173ec39da3f7f4e
Signed-off-by: Summer Qin <summer.qin@arm.com>
1 file changed