AM335x-based 'Gumstix Pepper' SBCs and variants use different types of
RAM (DDR2 vs DDR3 with DDR3 being the default). Detect the board type
by reading the factory-programmed EEPROM  and use this to select any
runtime boot options such as RAM type.
 http://elinux.org/BeagleBoardPinMux#List_of_Vendor_and_Device_IDsSigned-off-by: Adam YH Lee <email@example.com>
Signed-off-by: Ash Charles <firstname.lastname@example.org>