arm: Disable ATAGs support

With the exceptions of ds109, ds414, icnova-a20-swac, nokia_rx51 and
stemmy, disable ATAG support.  A large number of platforms had enabled
support but never supported a kernel so old as to require it.  Further,
some platforms are old enough to support both, but are well supported by
devicetree booting, and have been for a number of years.  This is
because some of the ATAGs related functions have been re-used to provide
the same kind of information, but for devicetree or just generally to
inform the user.  When needed still, rename these functions to
get_board_revision() instead, to avoid conflicts.  In other cases, these
functions were simply unused, so drop them.

Cc: Andre Przywara <andre.przywara@arm.com>
Cc: Jagan Teki <jagan@amarulasolutions.com>
Cc: Phil Sutter <phil@nwl.cc>
Cc: Stefan Bosch <stefan_b@posteo.net>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/board/toradex/common/tdx-common.c b/board/toradex/common/tdx-common.c
index 061abf7..9db4553 100644
--- a/board/toradex/common/tdx-common.c
+++ b/board/toradex/common/tdx-common.c
@@ -32,8 +32,8 @@
 static char *tdx_carrier_board_name;
 #endif
 
-#ifdef CONFIG_REVISION_TAG
-u32 get_board_rev(void)
+#if defined(CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG)
+u32 get_board_revision(void)
 {
 	/* Check validity */
 	if (!tdx_hw_tag.ver_major)
@@ -183,8 +183,8 @@
 
 #else /* CONFIG_TDX_CFG_BLOCK */
 
-#ifdef CONFIG_REVISION_TAG
-u32 get_board_rev(void)
+#if defined(CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG)
+u32 get_board_revision(void)
 {
 	return 0;
 }