CHROMIUM: arm64: qcom: qcs404-mistral: increase external buck max voltage

Increase external buck max voltage (rounded up to closest regulator step)
in accordance to QCS404 CPR Fusing Guide Rev 6.0.

Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>

BUG=b:129558664
TEST=Validate DVFS and schedutil governor
Git-repo: https://git.linaro.org/people/niklas.cassel/kernel.git


Git-commit: 3605637c6ce37c7b1ddf719daf3cfa65588ae0d3
Signed-off-by: Praveen Koya <pkoya@codeaurora.org>

Change-Id: I47b3104090a44ec9153ed332cfdccf8b5a128813
Signed-off-by: Vamsi Singamsetty <vamssi@codeaurora.org>
Signed-off-by: Khasim Syed Mohammed <khasim.mohammed@linaro.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/1664353


Reviewed-by: Zhihong Yu <zhihongyu@chromium.org>
Commit-Queue: Zhihong Yu <zhihongyu@chromium.org>
Tested-by: Zhihong Yu <zhihongyu@chromium.org>