ARM: dts: imx27-phytec-phycore: Rename file to match functionality

PCM038 dts can be used as base for development kit board or any
custom PCB designs. Renames this file to match functionality.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/Makefile

@@ -103,7 +103,7 @@ dtb-$(CONFIG_ARCH_MXC) += \
 	imx27-apf27.dtb \
 	imx27-apf27dev.dtb \
 	imx27-pdk.dtb \
-	imx27-phytec-phycore.dtb \
+	imx27-phytec-phycore-som.dtb \
 	imx31-bug.dtb \
 	imx51-apf51.dtb \
 	imx51-apf51dev.dtb \