iwlwifi: use iwl_poll_direct_bit in EEPROM reading

The patch replaces the current reading EEPROM loop iterations with
iwl_poll_direct_bit(). It also fixes some comment error.

Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-csr.h

@@ -216,6 +216,8 @@
 /* EEPROM REG */
 #define CSR_EEPROM_REG_READ_VALID_MSK	(0x00000001)
 #define CSR_EEPROM_REG_BIT_CMD		(0x00000002)
+#define CSR_EEPROM_REG_MSK_ADDR		(0x0000FFFC)
+#define CSR_EEPROM_REG_MSK_DATA		(0xFFFF0000)
 
 /* EEPROM GP */
 #define CSR_EEPROM_GP_VALID_MSK		(0x00000006)