drm/amd/display/dc/bios/bios_parser: Make local functions static

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:2588:16: warning: no previous prototype for ‘update_slot_layout_info’ [-Wmissing-prototypes]
 drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:2692:16: warning: no previous prototype for ‘get_bracket_layout_record’ [-Wmissing-prototypes]

Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Leo Li <sunpeng.li@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Igor Kravchenko <Igor.Kravchenko@amd.com>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/bios/bios_parser.c

@@ -2585,7 +2585,7 @@ static struct integrated_info *bios_parser_create_integrated_info(
 	return NULL;
 }
 
-enum bp_result update_slot_layout_info(
+static enum bp_result update_slot_layout_info(
 	struct dc_bios *dcb,
 	unsigned int i,
 	struct slot_layout_info *slot_layout_info,
@@ -2689,7 +2689,7 @@ enum bp_result update_slot_layout_info(
 }
 
 
-enum bp_result get_bracket_layout_record(
+static enum bp_result get_bracket_layout_record(
 	struct dc_bios *dcb,
 	unsigned int bracket_layout_id,
 	struct slot_layout_info *slot_layout_info)