Platform: Remove some legacy HAL APIs

This patch removes some legacy HAL APIs that are not used anymore.
And updates some documentations accordingly.

 - tfm_spm_hal_enable_fault_handlers
 - tfm_spm_hal_system_reset_cfg
 - tfm_spm_hal_init_debug
 - tfm_spm_hal_nvic_interrupt_target_state_cfg
 - tfm_spm_hal_nvic_interrupt_enable

Change-Id: I2f6f6e71e8e04b6916f5d08348fdb8ab403ac65c
Signed-off-by: Kevin Peng <kevin.peng@arm.com>
20 files changed