iwlwifi: use uCode error and event tables pointer w.r.t loaded image

This patch updates the usage of the pointers to error and log tables
received in alive response w.r.t. the current uCode image.

Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>