iwlwifi: pcie: support dumping FH in a000 hw

FH in A000 HW are placed in a different location,
and need to be read as prph, rather than direct.
Support A000 dumping as well as legacy.

Signed-off-by: Liad Kaufman <liad.kaufman@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>