iwlwifi: mvm: convert the SRAM dump to the generic memory dump

This allows to add the offset. The type of the generic
memory dump will let the parser know that this is SRAM.

Reviewed-by: Liad Kaufman <liad.kaufman@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>