[U-Boot] bootcount: Add dcache flush to bootcount_store()

[Tom Rini <trini@konsulko.com>]

On Wed, Mar 11, 2015 at 09:51:38AM +0100, Stefan Roese wrote:

> Without this dcache_flush the updated bootcounter may not be saved to
> its location.
> 
> This was detected on an iMX.6 platform using the OCRAM (internal SRAM)
> as bootcounter storage area. And issuing "reset" from within U-Boot
> cause the bootcounter to stay on its initial value.
> 
> Signed-off-by: Stefan Roese <sr@denx.de>
> Reviewed-by: Tom Rini <trini@konsulko.com>

OK, this breaks some platforms:
   powerpc:  +   TQM850L
+(TQM850L) drivers/built-in.o: In function `bootcount_store':
+(TQM850L) build/../drivers/bootcount/bootcount.c:64: undefined reference to `flush_dca che_range'
+(TQM850L) make[1]: *** [u-boot] Error 1
+(TQM850L) make: *** [sub-make] Error 2

We'll see how many others have the same problem soon and then I'll
decide on nuking the old platforms of holding off on this change.

-- 
Tom
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