kmtegr1: Drop CONFIG_KMTEGR1

The only usage of CONFIG_KMTEGR1 can be replaced by
CONFIG_TARGET_KMTEGR1 so do so and remove this other symbol.

Cc: Holger Brunck <holger.brunck@hitachienergy.com>
Cc: Heiko Schocher <hs@denx.de>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Holger Brunck <holger.brunck@hitachienergy.com>
diff --git a/board/keymile/common/ivm.c b/board/keymile/common/ivm.c
index ff550f7..67db0c5 100644
--- a/board/keymile/common/ivm.c
+++ b/board/keymile/common/ivm.c
@@ -306,7 +306,7 @@
 		return 0;
 	page2 = &buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN * 2];
 
-	if (IS_ENABLED(CONFIG_KMTEGR1)) {
+	if (IS_ENABLED(CONFIG_TARGET_KMTEGR1)) {
 		/* KMTEGR1 has a special setup. eth0 has no connection to the
 		 * outside and gets an locally administred MAC address, eth1 is
 		 * the debug interface and gets the official MAC address from