KSZ8851-SNL: Add ethtool support for EEPROM via eeprom_93cx6

Add ethtool EEPROM read/write support using the eeprom_93cx6
library instead of open-coding the functions.

Depends on eeprom_93cx6 driver getting EEPROM write support.

Change-Id: I06f3ab2b936244f658faae3ae8199a21de7b4d51
Signed-off-by: Ben Dooks <ben@simtec.co.uk>
Signed-off-by: Simtec Linux Team <linux@simtec.co.uk>
[sboyd@codeaurora.org: Removed previous eeprom implementation]
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index f6c44c6..8aab269 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -1795,6 +1795,8 @@
 	depends on SPI
 	select MII
 	select CRC32
+	select MISC_DEVICES
+	select EEPROM_93CX6
 	help
 	  SPI driver for Micrel KS8851 SPI attached network chip.