ARM: dts: qcom: msm8974-klte: Mark essential regulators

s1 and l12 regulators are used for the memory and cache on the Samsung
S5 (klte). If they are turned off the phone shuts down. So mark them as
always-on to prevent that from happening.

Signed-off-by: Iskren Chernev <iskren.chernev@gmail.com>
Tested-by: Alexey Minnekhanov <alexeymin@postmarketos.org>
Link: https://lore.kernel.org/r/20210201105657.1642825-4-iskren.chernev@gmail.com


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>