drm/amd/display: remove redundant assignment to variable dp_ref_clk_khz

The variable dp_ref_clk_khz is being initialized with a value that is
never read and it is being updated later with a new value. The
initialization is redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/dc/clk_mgr/dce100/dce_clk_mgr.c

···
 	struct clk_mgr_internal *clk_mgr = TO_CLK_MGR_INTERNAL(clk_mgr_base);
 	int dprefclk_wdivider;
 	int dprefclk_src_sel;
-	int dp_ref_clk_khz = 600000;
+	int dp_ref_clk_khz;
 	int target_div;
 
 	/* ASSERT DP Reference Clock source is from DFS*/