ARM: DTS: Update pcm052 based dts files (bk4r1/pcm052)

This commit provides update and renames the bk4r1.dts to vf610-bk4r1.dts
file with more on SoC HW description.
The pcm052.dts has been renamed to vf610-pcm052.dts as well.

Moreover, a new vf610-pcm052.drsi file has been introduced
to reuse the common code between devices based on Phytec's
pcm052 modules.
Ported from Linux kernel - v4.20 (tag)

Signed-off-by: Lukasz Majewski <lukma@denx.de>
diff --git a/configs/pcm052_defconfig b/configs/pcm052_defconfig
index e207df5..26ee823 100644
--- a/configs/pcm052_defconfig
+++ b/configs/pcm052_defconfig
@@ -24,7 +24,7 @@
 CONFIG_MTDPARTS_DEFAULT="mtdparts=NAND:640k(bootloader),128k(env1),128k(env2),128k(dtb),6144k(kernel),-(root)"
 CONFIG_CMD_UBI=y
 CONFIG_OF_CONTROL=y
-CONFIG_DEFAULT_DEVICE_TREE="pcm052"
+CONFIG_DEFAULT_DEVICE_TREE="vf610-pcm052"
 CONFIG_ENV_IS_IN_NAND=y
 CONFIG_DM=y
 CONFIG_DM_GPIO=y