regulator: qcom_smd: Fix up PM8950 regulator configuration

Following changes have been made:

- S5, L4, L18, L20 and L21 were removed (S5 is managed by
SPMI, whereas the rest seems not to exist [or at least it's blocked
by Sony Loire /MSM8956/ RPM firmware])

- Supply maps have were adjusted to reflect regulator changes.

Fixes: e44adca5

 ("regulator: qcom_smd: Add PM8950 regulators")
Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Link: https://lore.kernel.org/r/20220430163753.609909-1-konrad.dybcio@somainline.org
Signed-off-by: Mark Brown <broonie@kernel.org>