ARM: rockchip: Add rv1108-elgin-r1 board support

Add the initial support for Elgin R1 board, which is based on the
RV1108 SoC and has the following features currently supported in
U-Boot:

- UART
- eMMC
- USB

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
diff --git a/board/elgin/elgin_rv1108/MAINTAINERS b/board/elgin/elgin_rv1108/MAINTAINERS
new file mode 100644
index 0000000..7747490
--- /dev/null
+++ b/board/elgin/elgin_rv1108/MAINTAINERS
@@ -0,0 +1,6 @@
+ELGIN-RV1108
+M:      Otavio Salvador <otavio@ossystems.com.br>
+S:      Maintained
+F:      board/elgin/elgin_rv1108
+F:      include/configs/elgin_rv1108.h
+F:      configs/elgin-rv1108_defconfig