ARM: imx: remove unused imx3 pm definitions

Remove the defintion of mx3_cpu_lp_set(), this function is not
implemented anywhere. Remove then mx3_cpu_pwr_mode enum as well,
it was used only as parameter of mx3_cpu_lp_set().
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/mach-imx/common.h

@@ -71,15 +71,6 @@ enum mxc_cpu_pwr_mode {
 	STOP_POWER_OFF,		/* STOP + SRPG */
 };
 
-enum mx3_cpu_pwr_mode {
-	MX3_RUN,
-	MX3_WAIT,
-	MX3_DOZE,
-	MX3_SLEEP,
-};
-
-void mx3_cpu_lp_set(enum mx3_cpu_pwr_mode mode);
-
 void imx_enable_cpu(int cpu, bool enable);
 void imx_set_cpu_jump(int cpu, void *jump_addr);
 u32 imx_get_cpu_arg(int cpu);