nitrogen6x: use common detect_hdmi

Signed-off-by: Eric Bénard <eric@eukrea.com>

board/boundary/nitrogen6x/nitrogen6x.c

@@ -445,12 +445,6 @@ static iomux_v3_cfg_t const rgb_pads[] = {
 	MX6_PAD_DISP0_DAT23__IPU1_DISP0_DATA23,
 };
 
-static int detect_hdmi(struct display_info_t const *dev)
-{
-	struct hdmi_regs *hdmi	= (struct hdmi_regs *)HDMI_ARB_BASE_ADDR;
-	return readb(&hdmi->phy_stat0) & HDMI_DVI_STAT;
-}
-
 static void do_enable_hdmi(struct display_info_t const *dev)
 {
 	imx_enable_hdmi_phy();