Switch EEPROM out for NOR flash for non-volatile storage

User settings were supposed to be stored on the I2C EEPROM, however the AT34 does not use the same addressing scheme as the AT24, therefore the kernel driver can only access the first 2KB. The driver also does not support mounting as a block device. A larger NOR flash could be placed on SPI1 and have the same write cycle life but be mountable as a /dev/mtd* device.