The defconfig for the at91sam9rl is quite old, refresh it:
- now uses EABI instead of OABI
- add devtmpfs support
- add UBI/UBIfs support
- remove a few config symbols that disappeared
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>