OMAP2+: voltage: move VC into struct voltagedomain, misc. renames

Move the VC instance struct from omap_vdd_info into struct voltagedomain.
While moving, perform some misc. renames for readability.

No functional changes.

Summary of renames:
- rename omap_vc_instance to omap_vc_channel, since there is only
  one instance of the VC IP and this actually represents channels
  using TRM terminology.
- rename 'vc_common' field of VC channel which led to:
  s/vc->vc_common/vc->common/
- remove redundant '_data' suffix
- OMAP3: vc1 --> vc_mpu, vc2 --> vc_core
- omap_vc_bypass_scale_voltage() -> omap_vc_bypass_scale()

Signed-off-by: Kevin Hilman <khilman@ti.com>

merge
diff --git a/arch/arm/mach-omap2/voltagedomains3xxx_data.c b/arch/arm/mach-omap2/voltagedomains3xxx_data.c
index d7e1052..7cb27ec 100644
--- a/arch/arm/mach-omap2/voltagedomains3xxx_data.c
+++ b/arch/arm/mach-omap2/voltagedomains3xxx_data.c
@@ -41,7 +41,6 @@
 	.prm_irqst_mod = OCP_MOD,
 	.prm_irqst_reg = OMAP3_PRM_IRQSTATUS_MPU_OFFSET,
 	.vp_data = &omap3_vp1_data,
-	.vc_data = &omap3_vc1_data,
 	.vfsm = &omap3_vdd1_vfsm_data,
 };
 
@@ -55,19 +54,20 @@
 	.prm_irqst_mod = OCP_MOD,
 	.prm_irqst_reg = OMAP3_PRM_IRQSTATUS_MPU_OFFSET,
 	.vp_data = &omap3_vp2_data,
-	.vc_data = &omap3_vc2_data,
 	.vfsm = &omap3_vdd2_vfsm_data,
 };
 
 static struct voltagedomain omap3_voltdm_mpu = {
 	.name = "mpu_iva",
 	.scalable = true,
+	.vc = &omap3_vc_mpu,
 	.vdd = &omap3_vdd1_info,
 };
 
 static struct voltagedomain omap3_voltdm_core = {
 	.name = "core",
 	.scalable = true,
+	.vc = &omap3_vc_core,
 	.vdd = &omap3_vdd2_info,
 };