drm/amd/display: Add missing instance for clock source register

[Description]
Need to add inst 5 for clk_src_regs because
there are 5 PHY instances in DCN32 & DCN321.
Signed-off-by: Alvin Lee <alvin.lee2@amd.com>
Acked-by: Jerry Zuo <jerry.zuo@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c

@@ -330,7 +330,8 @@ static const struct dce110_clk_src_regs clk_src_regs[] = {
 	clk_src_regs(0, A),
 	clk_src_regs(1, B),
 	clk_src_regs(2, C),
-	clk_src_regs(3, D)
+	clk_src_regs(3, D),
+	clk_src_regs(4, E)
 };
 
 static const struct dce110_clk_src_shift cs_shift = {

drivers/gpu/drm/amd/display/dc/dcn321/dcn321_resource.c

@@ -333,7 +333,8 @@ static const struct dce110_clk_src_regs clk_src_regs[] = {
 	clk_src_regs(0, A),
 	clk_src_regs(1, B),
 	clk_src_regs(2, C),
-	clk_src_regs(3, D)
+	clk_src_regs(3, D),
+	clk_src_regs(4, E)
 };
 
 static const struct dce110_clk_src_shift cs_shift = {