[U-Boot] gunzip.c: use block layer for writes

[Tom Rini]

On Mon, Apr 11, 2016 at 03:21:37PM -0700, Eric Nelson wrote:

> Call blk_dwrite to ensure that the block cache is notified
> if enabled and remove build breakage when CONFIG_BLK is enabled.
> 
> Signed-off-by: Eric Nelson <eric at nelint.com>
> Reviewed-by: Stephen Warren <swarren at nvidia.com>

Applied to u-boot/master, thanks!

-- 
Tom
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