ARM: uniphier: split u-boot,dm-pre-reloc out to uniphier-v7-u-boot.dtsi

UniPhier 32-bit SoCs use CONFIG_SPL_OF_CONTROL.  So, many nodes must
be marked as dm-pre-reloc to prevent fdtgrep from stripping them off.

Sprinkling U-Boot-specific properties all over the place is painful
because DT files are synced with Linux from time to time.

Split u-boot,dm-pre-reloc out to uniphier-v7-u-boot.dtsi, which is
appended to UniPhier V7 DTS before the build.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
diff --git a/arch/arm/mach-uniphier/Kconfig b/arch/arm/mach-uniphier/Kconfig
index de3bdc0..cc759b3 100644
--- a/arch/arm/mach-uniphier/Kconfig
+++ b/arch/arm/mach-uniphier/Kconfig
@@ -117,4 +117,6 @@
 	  The command "ddrmphy" shows the resulting parameters of DDR Multi PHY
 	  training; it is useful for the evaluation of DDR Multi PHY training.
 
+config SYS_SOC
+	default "uniphier-v7" if ARCH_UNIPHIER_LD4_SLD8 || ARCH_UNIPHIER_V7_MULTI
 endif