command: Remove the cmd_tbl_t typedef

We should not use typedefs in U-Boot. They cannot be used as forward
declarations which means that header files must include the full header to
access them.

Drop the typedef and rename the struct to remove the _s suffix which is
now not useful.

This requires quite a few header-file additions.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/board/freescale/t102xrdb/cpld.c b/board/freescale/t102xrdb/cpld.c
index 2b640e0..47c3b16 100644
--- a/board/freescale/t102xrdb/cpld.c
+++ b/board/freescale/t102xrdb/cpld.c
@@ -72,7 +72,7 @@
 	putc('\n');
 }
 
-int do_cpld(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int do_cpld(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	int rc = 0;
 
diff --git a/board/freescale/t102xrdb/t102xrdb.c b/board/freescale/t102xrdb/t102xrdb.c
index 983c723..754fcb0 100644
--- a/board/freescale/t102xrdb/t102xrdb.c
+++ b/board/freescale/t102xrdb/t102xrdb.c
@@ -368,8 +368,8 @@
 	return 0;
 }
 
-static int switch_cmd(cmd_tbl_t *cmdtp, int flag, int argc,
-		    char * const argv[])
+static int switch_cmd(struct cmd_tbl *cmdtp, int flag, int argc,
+		      char *const argv[])
 {
 	if (argc < 2)
 		return CMD_RET_USAGE;