Remove unnecessary instances of DECLARE_GLOBAL_DATA_PTR

We have a large number of places where while we historically referenced
gd in the code we no longer do, as well as cases where the code added
that line "just in case" during development and never dropped it.

Signed-off-by: Tom Rini <trini@konsulko.com>

env/ext4.c

@@ -31,8 +31,6 @@
 #include <ext4fs.h>
 #include <mmc.h>
 
-DECLARE_GLOBAL_DATA_PTR;
-
 #ifdef CONFIG_CMD_SAVEENV
 static int env_ext4_save(void)
 {

env/fat.c

@@ -31,8 +31,6 @@
 # endif
 #endif
 
-DECLARE_GLOBAL_DATA_PTR;
-
 #ifdef CMD_SAVEENV
 static int env_fat_save(void)
 {

env/sata.c

@@ -24,8 +24,6 @@
 #error CONFIG_ENV_OFFSET or CONFIG_ENV_SIZE not defined
 #endif
 
-DECLARE_GLOBAL_DATA_PTR;
-
 __weak int sata_get_env_dev(void)
 {
 	return CONFIG_SYS_SATA_ENV_DEV;