rcar-gen3: README: Use Markdown formatting

This commit edits README files to use Markdown formatting.
There are also some modifications:

- Removed dependency on meta-renesas itself in
meta-rcar-gen3/README.md and meta-rcar-gen3/README.linaro
- Added E3 SoC information to meta-rcar-gen3/README.md
- Replaced core-image-x11 by core-image-minimal in README.md,
this image is not maintained.

Signed-off-by: Duy Dang <duy.dang.yw@rvc.renesas.com>
Signed-off-by: Khang Nguyen <khang.nguyen.xw@renesas.com>
Signed-off-by: Takamitsu Honda <takamitsu.honda.pv@renesas.com>

1 files changed, 27 insertions, 0 deletions

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+# OpenEmbedded/Yocto BSP layer for Renesas Electronics's SoCs
+
+This layer provides support for Renesas Electronics's platforms for use with
+OpenEmbedded and/or Yocto.
+
+Layer maintainer: Takamitsu Honda <takamitsu.honda.pv@renesas.com>
+
+## Supported Boards/Machines
+
+
+In addition, this also provides layer which supports boards using Renesas SoCs.
+Layer and boards that support is the following:
+
+    meta-rcar-gen3
+        - Renesas Electronics Corporation. Salvator-X (R8A7795/R8A7796/R8A77965)
+        - Renesas Electronics Corporation. R-Car Starter Kit premier(H3ULCB) (R8A7795)
+        - Renesas Electronics Corporation. R-Car Starter Kit pro(M3ULCB) (R8A7796)
+        - Renesas Electronics Corporation. R-Car Ebisu (R8A77990)
+
+Please see README in the layer directory for the description of the board.
+
+## Original BSP image
+
+The meta-renesas layer provides original BSP image. The following:
+
+* core-image-minimal
+* core-image-weston