drm/tegra: sor: Remove temporary workaround

Remove the temporary workaround of storing the Tegra186 HDMI/DP I/O pad
ID in the SOR driver. The definition has long been available in the
soc/tegra/pmc.h header file.
Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/gpu/drm/tegra/sor.c

@@ -31,14 +31,6 @@
 #include "sor.h"
 #include "trace.h"
 
-/*
- * XXX Remove this after the commit adding it to soc/tegra/pmc.h has been
- * merged. Having this around after the commit is merged should be safe since
- * the preprocessor will effectively replace all occurrences and therefore no
- * duplicate will be defined.
- */
-#define TEGRA_IO_PAD_HDMI_DP0 26
-
 #define SOR_REKEY 0x38
 
 struct tegra_sor_hdmi_settings {