Sony Xperia Z1 and Z1 compact are almost identical, and that shows in
their DTs. Commonize the repeating parts and modernize the DTs to use
labels.

As a bonus, Z1C gains touchscreen support in this commit, as it was
present on Z1 already.
Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>
[bjorn: Rebased on top of Krzysztof's fixes]
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220415115633.575010-13-konrad.dybcio@somainline.org