UPSTREAM: pinctrl: qcom: Introduce readl/writel accessors

In preparation for the support for dispersed tiles move all readl and
writel calls to helper functions. This will allow us to isolate the
added complexity of another indirection.

Change-Id: I2ce7024f0deb1391ba552afee241ceb6a0484772
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
(cherry picked from commit 6c736989
https://github.com/torvalds/linux.git

)
signed-off-by: Prashanth Vadde <pvadde@codeaurora.org>
Reviewed-on: https://chromium-review.googlesource.com/c/1343222


Reviewed-by: Zhihong Yu <zhihongyu@chromium.org>
Tested-by: SANTHOSH JANARDHANA HASSAN <sahassan@google.com>
Commit-Queue: Zhihong Yu <zhihongyu@chromium.org>