ath9k: Allow platform override without EEPROM override

Add a new platform data flag "use_eeprom" that indicates that the eeprom
found on the card itself should be used instead of the one present in
the platform data.

This allows to override the MAC address of a PCI card while preserving
the eeprom data from the card itself.

The default behavior is preserved.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/linux/ath9k_platform.h b/include/linux/ath9k_platform.h
index 8598f8e..a495a95 100644
--- a/include/linux/ath9k_platform.h
+++ b/include/linux/ath9k_platform.h
@@ -36,6 +36,8 @@
 
 	int (*get_mac_revision)(void);
 	int (*external_reset)(void);
+
+	bool use_eeprom;
 };
 
 #endif /* _LINUX_ATH9K_PLATFORM_H */