[U-Boot] rtc: Add read8 and write8 support to isl1208 driver

[Tom Rini]

On Thu, May 31, 2018 at 11:14:44AM -0700, Trent Piepho wrote:

> This can be used for device register access from board code.
> 
> This allows access to capabilities in the RTC chip not abstracted in
> U-Boot's RTC class.  E.g., device NVRAM or a tamper detection circuit.
> 
> Cc: Klaus Goger <klaus.goger at theobroma-systems.com>
> Cc: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
> Cc: Simon Glass <sjg at chromium.org>
> Signed-off-by: Trent Piepho <tpiepho at impinj.com>
> Reviewed-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>

Applied to u-boot/master, thanks!

-- 
Tom
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