[U-Boot] atstk100x: switch to common cfi driver

[Andreas Bießmann <biessmann@corscience.de>]

This patch removes the board implemenatation for flash driver which can now
safely switched to the common cfi driver.

Compile tested for all atstk100x boards, runtime tested on atstk1002.

Signed-off-by: Andreas Bießmann <biessmann at corscience.de>

>>
>> <snip>
>>
>>> andreas.devel at googlemail.com (8):
>>>        at91rm9200.h: fix ATMEL_PMX_AA_TXD2
>>>        arm920t/at91: add clock.c
>>>        arm920t/at91: use new clock.c features
>>>        arm920t/at91: add at91rm9200_devices.c
>>>        at91rm9200ek: use atmel_usart
>>>        eb_cpux9k2: use atmel_usart
>>>        cpuat91: use atmel_usart
>>>        driver/serial: delete at91rm9200_usart

Patchworks says: Signed-off-by: Andreas Bießmann <biessmann at corscience.de>

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