[PATCH][I2C] ST M41T00 I2C RTC chip driver

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Greg KH wrote:

>Can you resend it with a proper Changelog description in the top of the
>email and the signed-off-by line?  thanks,
>
>greg k-h
>
>  
>
Certainly.
--

This patch adds support for the ST M41T00 I2C RTC chip.

This rtc chip has no mechanism to freeze it's registers while being 
read; however, it will delay updating the external values of the 
registers for 250ms after a register is read.  To ensure that a sane 
time value is read, the driver verifies that the same registers values 
were read twice before returning.

Also, when setting the rtc from an interrupt handler, a tasklet is used 
to provide the context required by the i2c core code.

Please apply.

Signed-off-by: Mark A. Greer <mgreer at mvista.com>
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