arm64: dts: qcom: qcs6490-rb3gen2: Name the regulators

arm64: dts: qcom: qcs6490-rb3gen2: Name the regulators

Without explicitly specifying names for the regulators they are named
based on the DeviceTree node name. This results in multiple regulators
with the same name, making debug prints and regulator_summary impossible
to reason about.

Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20240227-rb3gen2-regulator-names-v1-1-63ceb845dcc8@quicinc.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>