net/ice/base: read security revision

net/ice/base: read security revision

The main NVM module and the Option ROM module contain a security
revision in their CSS header. This security revision is used to
determine whether or not the signed module should be loaded at bootup.
If the module security revision is lower than the associated minimum
security revision, it will not be loaded.

The CSS header does not have a module id associated with it, and thus
requires flat NVM reads in order to access it. To do this, take
advantage of the cached bank information. Introduce a new
"ice_read_flash_module" function that takes the module and bank to read.
Implement both ice_read_active_nvm_module and
ice_read_active_orom_module. These functions will use the cached values
to determine the active bank and calculate the appropriate offset.

Using these new access functions, extract the security revision for both
the main NVM bank and the Option ROM into the associated info structure.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
Acked-by: Qiming Yang <qiming.yang@intel.com>