[beagleboard] Booting from MMC1

Just go hard code into u-boot and the kernel the values that are
currently wanting to be gotten from the EEPROM. Or, put values that the
images you're using want into the EEPROM (the bone SRM has this info).
You can write to the EEPROM rather easily from u-boot, if you can get a
prompt, or alternatively, you can buy off the shelf I2C programmers to
program the EEPROM before you solder (or socket) it down.