[ARM] pxafb: add color TFT 8BPP LCD panel type

#define LCD_MONO_DSTN_8BPP	((8  << 4) | LCD_TYPE_MONO_DSTN)

#define LCD_COLOR_STN_8BPP	((8  << 4) | LCD_TYPE_COLOR_STN)

#define LCD_COLOR_DSTN_16BPP	((16 << 4) | LCD_TYPE_COLOR_DSTN)

#define LCD_COLOR_TFT_8BPP	((8  << 4) | LCD_TYPE_COLOR_TFT)

#define LCD_COLOR_TFT_16BPP	((16 << 4) | LCD_TYPE_COLOR_TFT)

#define LCD_COLOR_TFT_18BPP	((18 << 4) | LCD_TYPE_COLOR_TFT)

#define LCD_SMART_PANEL_8BPP	((8  << 4) | LCD_TYPE_SMART_PANEL)