arm64: dts: qcom: msm8916-huawei-g7: Clarify installation instructions

The comment with installation instructions in the huawei-g7 device tree
is a bit misleading and does not describe the recommended installation
steps very well. The bootloader is actually not patched; to avoid all
trouble with the vendor bootloader it is easier to bypass it completely
by jumping to a custom bootloader (e.g. based on the open-source LK
released by Qualcomm).

To avoid confusion, simplify the comment to state only the problem
and then refer to the wiki article which contains detailed suggested
installation instructions. This will also make it easier to keep it
up to date with new developments in the future.

Fixes: 55056b22 ("arm64: dts: qcom: msm8916: Add device tree for Huawei Ascend G7")
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220410195113.13646-2-stephan@gerhold.net