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/inversepath/usbarmory/usbarmory.c b/board/inversepath/usbarmory/usbarmory.c
index 086d052..7dbb3a9 100644
--- a/board/inversepath/usbarmory/usbarmory.c
+++ b/board/inversepath/usbarmory/usbarmory.c
@@ -27,6 +27,7 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
+#ifdef CONFIG_REVISION_TAG
 u32 get_board_rev(void)
 {
 	struct iim_regs *iim = (struct iim_regs *)IMX_IIM_BASE;
@@ -38,6 +39,7 @@
 
 	return (get_cpu_rev() & ~(0xF << 8)) | (rev & 0xF) << 8;
 }
+#endif
 
 struct fsl_esdhc_cfg esdhc_cfg[1] = {
 	{MMC_SDHC1_BASE_ADDR}