Recent commit introduces compiler Error in some platforms

[Luis de Bethencourt]

Hi all,

As can be seen in Han's build log:
http://hverkuil.home.xs4all.nl/logs/Saturday.log

The recent commit bc0c5aa35ac88342831933ca7758ead62d9bae2b introduces a
compiler error in some platforms.

/home/hans/work/build/media_build/v4l/ir-hix5hd2.c: In function 'hix5hd2_ir_config':
/home/hans/work/build/media_build/v4l/ir-hix5hd2.c:95:2: error: implicit declaration of function 'writel_relaxed' [-Werror=implicit-function-declaration]
  writel_relaxed(0x01, priv->base + IR_ENABLE);
  ^

Better than reverting, what would be a good solution for this problem?
I am happy to implment it once I know what is the right direction.

>From what I see that commit mentions that the function is now available from
include/asm-generic/io.h, but this isn't included.

Thanks,
Luis
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