SSI-87: imx8: Configure SNVS

SSI-87: imx8: Configure SNVS

Add a module to configure the tamper and secure violation of
the SNVS using the SCU API.

The module also adds some commands:
 - snvs_cfg: Configure the SNVS HP and LP registers
 - snvs_dgo_cfg: Configure the SNVS DGO bloc if present (8QXP)
 - tamper_pin_cfg: Change the configuration of the tamper pins
 - snvs_clear_status: Allow to write to LPSR and LPTDSR to clear status bits

Signed-off-by: Franck LENORMAND <franck.lenormand@nxp.com>
Reviewed-by: Silvano Di Ninno <silvano.dininno@nxp.com>
(cherry picked from commit b84be4fa1454ee0cd718be329d630b55aff34273)
(cherry picked from commit 24b0be839ea2166ee80194b93d8efcca70b81539)