msm: spm: Replace msm_spm_apcs_set_vdd with msm_spm_set_vdd

msm_spm_apcs_set_vdd() is used to set the vdd of a gang rail through the
L2 SAW2. Remove this api and overload the msm_spm_set_vdd() call with a
dont-care 'cpu' argument instead.

Detect if the target is configured to use L2 SAW as APCS master using a
boolean property in the device tree.

Change-Id: Ib8d9605474fa44d5223985ec8cb1040cde230592
Signed-off-by: Praveen Chidambaram <pchidamb@codeaurora.org>
diff --git a/arch/arm/boot/dts/msm8974-v1-pm.dtsi b/arch/arm/boot/dts/msm8974-v1-pm.dtsi
index dc41149..17d3fce 100644
--- a/arch/arm/boot/dts/msm8974-v1-pm.dtsi
+++ b/arch/arm/boot/dts/msm8974-v1-pm.dtsi
@@ -127,6 +127,7 @@
 		qcom,saw2-spm-cmd-gdhs = [00 20 32 42 07 44 22 50 02 32 50 0f];
 		qcom,saw2-spm-cmd-pc = [00 10 32 b0 11 42 07 01 b0 12 44
 				50 02 32 50 0f];
+		qcom,L2-spm-is-apcs-master;
 	};
 
 	qcom,lpm-levels {