video: tegra20: dc: remove DECLARE_GLOBAL_DATA_PTR use

It seems that DECLARE_GLOBAL_DATA_PTR use is not needed and video system
works perfectly fine without it.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
diff --git a/drivers/video/tegra20/tegra-dc.c b/drivers/video/tegra20/tegra-dc.c
index accabbf..d24aa37 100644
--- a/drivers/video/tegra20/tegra-dc.c
+++ b/drivers/video/tegra20/tegra-dc.c
@@ -26,8 +26,6 @@
 
 #include "tegra-dc.h"
 
-DECLARE_GLOBAL_DATA_PTR;
-
 /* Holder of Tegra per-SOC DC differences */
 struct tegra_dc_soc_info {
 	bool has_timer;