board/spear/common: move code to arch/arm/cpu/arm926ejs/spear/

The code in board/spear/common/ is not board-specific but
SoC-specific. Therefore, boards from other vendors than "spear" may
want to re-use this code, which is currently difficult with the code
being placed in board/spear/common/.

Since this code really is SoC-specific, this commit moves it to
arch/arm/cpu/arm926ejs/spear/, with the rest of the SPEAr related
code.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

arch/arm/cpu/arm926ejs/spear/Makefile

@@ -16,6 +16,8 @@ obj-$(CONFIG_DDR_MT47H64M16) += spr600_mt47h64m16_3_333_cl5_psync.o
 obj-$(CONFIG_DDR_MT47H32M16) += spr600_mt47h32m16_333_cl5_psync.o
 obj-$(CONFIG_DDR_MT47H32M16) += spr600_mt47h32m16_37e_166_cl4_sync.o
 obj-$(CONFIG_DDR_MT47H128M8) += spr600_mt47h128m8_3_266_cl5_async.o
+else
+obj-y += spr_misc.o spr_lowlevel_init.o
 endif
 
 extra-$(CONFIG_SPL_BUILD) := start.o

board/spear/common/Makefile

@@ -1,14 +0,0 @@
-#
-# (C) Copyright 2006
-# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
-#
-# SPDX-License-Identifier:	GPL-2.0+
-#
-
-ifdef CONFIG_SPL_BUILD
-# necessary to create built-in.o
-obj- := __dummy__.o
-else
-obj-y	:= spr_misc.o
-obj-y	+= spr_lowlevel_init.o
-endif