net/ice/base: support NVM rollback detection

net/ice/base: support NVM rollback detection

This patch adds code to detect NVM rollback. The rollback detection
is done as part of the HW init flow. When NVM rollback is detected,
a warning message is printed along with the FW/NVM version data.
To do this, this patch adds a helper function ice_get_nvm_version.

Also, a pointer to hw->nvm is already available in ice_init_nvm. Just use
this instead of &hw->nvm.

Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Signed-off-by: Paul M Stillwell Jr <paul.m.stillwell.jr@intel.com>
Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
Acked-by: Xiaolong Ye <xiaolong.ye@intel.com>