arm64: dts: qcom: sdm845-starqltechn: fix usb regulator mistake

arm64: dts: qcom: sdm845-starqltechn: fix usb regulator mistake

Usb regulator was wrongly pointed to vreg_l1a_0p875.
However, on starqltechn it's powered from vreg_l5a_0p8.

Fixes: d711b22eee55 ("arm64: dts: qcom: starqltechn: add initial device tree for starqltechn")
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Dzmitry Sankouski <dsankouski@gmail.com>
Link: https://lore.kernel.org/r/20250225-starqltechn_integration_upstream-v9-3-a5d80375cb66@gmail.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>