iwlwifi: remove EXPORT_SYMBOL for static symbol

It does not make sense to apply EXPORT_SYMBOL to a static symbol.  Fixes
this build error:

drivers/net/wireless/iwlwifi/iwl3945-base.c:1697: error: __ksymtab_iwl3945_rx_queue_reset causes a section type conflict

Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>