drm/bridge: fix build with CONFIG_OF=n

drm/bridge: fix build with CONFIG_OF=n

Commit 5164553d739e ("drm/bridge: add devm_drm_put_bridge()") adds two
declarations for devm_drm_put_bridge():

 1) an inline declaration in the #else branch of
    '#if defined(CONFIG_OF)...'
 2) one outside of the same #if

This results in a build failure with CONFIG_OF=n:

  ../drivers/gpu/drm/drm_bridge.c:1406:6: error: redefinition of ‘devm_drm_put_bridge’

The function has nothing to do with OF, thus fix by removing declaration 1.

Fixes: 5164553d739e ("drm/bridge: add devm_drm_put_bridge()")
Reported-by: Ville Syrjala <ville.syrjala@linux.intel.com>
Closes: https://oftc.catirclogs.org/dri-devel/2025-05-21#34288266;
Tested-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Reviewed-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Link: https://lore.kernel.org/r/20250522-devm_drm_put_bridge-fix-non-of-build-v1-1-a05234dea046@bootlin.com
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>