ARM: OMAP2+: voltage: fixup oscillator handling when CONFIG_PM=n

commit 908b75e8 (ARM: OMAP: add support for oscillator setup) added a new
API for oscillator setup, but is broken when CONFIG_PM=n.

The new functions have dummy definitions when CONFIG_PM=n, but also have
full implementations available, which conflict.

To fix, wrap the PM implmentations in #ifdef CONFIG_PM.

Cc: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/vc.c

@@ -666,6 +666,7 @@ static u8 omap_vc_calc_vsel(struct voltagedomain *voltdm, u32 uvolt)
 	return voltdm->pmic->uv_to_vsel(uvolt);
 }
 
+#ifdef CONFIG_PM
 /**
  * omap_pm_setup_sr_i2c_pcb_length - set length of SR I2C traces on PCB
  * @mm: length of the PCB trace in millimetres
@@ -678,6 +679,7 @@ void __init omap_pm_setup_sr_i2c_pcb_length(u32 mm)
 {
 	sr_i2c_pcb_length = mm;
 }
+#endif
 
 void __init omap_vc_init_channel(struct voltagedomain *voltdm)
 {