hdmi: toggle: fix looping in HDP mode detection.

When users disable HDMI bx the toggle, the hdmi_panel driver constantly tries to redetect a big screen - for those who are facing the 'false positive' detected HDMI cable bug. In log:

<6>[ 1427.757263,0] hpd 0
<3>[ 1427.787353,0] in hpd work 0, state=0
<6>[ 1427.787719,0] HDMI_TOGGLE: Panel disabled by user
<6>[ 1427.981567,0] hpd 1
<3>[ 1428.021759,1] in hpd work 1, state=0
<6>[ 1428.022125,1] HDMI_TOGGLE: Panel disabled by user
<6>[ 1428.263397,0] hpd 0
<3>[ 1428.287322,1] in hpd work 0, state=0
<6>[ 1428.287689,1] HDMI_TOGGLE: Panel disabled by user
<6>[ 1428.307067,0] hpd 1
<3>[ 1428.349884,0] in hpd work 1, state=0
<6>[ 1428.350128,0] HDMI_TOGGLE: Panel disabled by user
<6>[ 1428.480651,0] hpd 0
<6>[ 1428.481231,0] hpd 1
<3>[ 1428.521697,0] in hpd work 1, state=0
<6>[ 1428.521881,0] HDMI_TOGGLE: Panel disabled by user
<6>[ 1429.019317,0] hpd 0
<3>[ 1429.045135,0] in hpd work 0, state=0
<6>[ 1429.045318,0] HDMI_TOGGLE: Panel disabled by user
<6>[ 1429.089874,0] hpd 1
<6>[ 1429.102966,0] hpd 0
<6>[ 1429.114349,0] hpd 1
<3>[ 1429.154510,0] in hpd work 1, state=0

Fix this by exiting the function instead of returning to the common path