ARM: rmobile: lager: Move rcar-gen2-common to rcar-common

To common use of rcar-gen2-common directory in the R-Car SoCs,
and change from rcar-gen2-common to rcar-common.
Signed-off-by: NNobuhiro Iwamatsu <iwamatsu@nigauri.org>

board/renesas/lager/Makefile

@@ -6,4 +6,4 @@
 # SPDX-License-Identifier: GPL-2.0
 #
 
-obj-y	:= lager.o qos.o ../rcar-gen2-common/common.o
+obj-y	:= lager.o qos.o ../rcar-common/common.o