drm/bridge: ti-sn65dsi86: Fix unbalanced pm_runtime state

The commit 016204fe ("drm/bridge: ti-sn65dsi86: Detect id panel
is connected") has added a pm_runtime_get_sync() call in the
ti_sn_aux_transfer() function, and is expected to unwind before
returning from the function. The logic erroneously added another
pm_runtime_get_sync() instead of a pm_runtime_put_sync() call.
Fix this.

Fixes: 016204fe

 ("drm/bridge: ti-sn65dsi86: Detect id panel is connected")
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Rahul T R <r-ravikumar@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>