imx233: factor adc accross targets

The old code allowed each target to specify its adc targets but this proved
useless since the target rely directly on imx233/lradc for input method and
generic adc is mostly used for battery and debug. Remove all target specific
files and provide a generic implemenation. The targets can still specify a
battery temperature channel in powermgmt-target.h

Change-Id: I68cf2e3e46379d174ac6d774ffb237bb15a19ae3

firmware/target/arm/imx233/adc-target.h

@@ -0,0 +1,47 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2011 by Amaury Pouly
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#ifndef _ADC_IMX233_H_
+#define _ADC_IMX233_H_
+
+#include "system.h"
+#include "adc.h"
+#include "adc-target.h"
+#include "powermgmt-target.h"
+#include "lradc-imx233.h"
+
+enum imx233_adc_channel_t
+{
+    ADC_BATTERY, /* Battery voltage (mV) */
+    ADC_DIE_TEMP, /* Die temperature (°C) */
+    ADC_VDDIO, /* VDDIO (mV) */
+#if IMX233_SUBTARGET >= 3700
+    ADC_VDD5V, /* VDD5V (mV) */
+#endif
+#ifdef IMX233_BATT_TEMP_SENSOR
+    ADC_BATT_TEMP, /* Battery temperature (°C) */
+#endif
+    NUM_ADC_CHANNELS,
+};
+
+/* Return channel name */
+const char *adc_name(int channel);
+
+#endif