drm/amd/display: remove set but not used variable 'bp' in bios_parser.c

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/gpu/drm/amd/display/dc/bios/bios_parser.c: In function bios_get_board_layout_info:
drivers/gpu/drm/amd/display/dc/bios/bios_parser.c:2743:22: warning: variable bp set but not used [-Wunused-but-set-variable]

It is introduced by commit 1eeedbcc ("drm/amd/display:
get board layout for edid emulation"), but never used,
so remove it.
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: zhengbin <zhengbin13@huawei.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -2739,7 +2739,6 @@ static enum bp_result bios_get_board_layout_info(
 	struct board_layout_info *board_layout_info)
 {
 	unsigned int i;
-	struct bios_parser *bp;
 	enum bp_result record_result;
 
 	const unsigned int slot_index_to_vbios_id[MAX_BOARD_SLOTS] = {
@@ -2748,7 +2747,6 @@ static enum bp_result bios_get_board_layout_info(
 		0, 0
 	};
 
-	bp = BP_FROM_DCB(dcb);
 	if (board_layout_info == NULL) {
 		DC_LOG_DETECTION_EDID_PARSER("Invalid board_layout_info\n");
 		return BP_RESULT_BADINPUT;