PCI: qcom: Use regulator bulk api for apq8064 supplies

This patch converts existing regulators to use regulator bulk apis,
to make it consistent with msm8996 changes also cut down some redundant code.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Stanimir Varbanov <svarbanov@mm-sol.com>