cubieboard7: Remove ARCH= references from documentation

When building U-Boot we select the architecture via Kconfig and not ARCH
being passed in via the environment or make cmdline.

While in here, add the doc file to the MAINTAINERS entry.

Cc: Amit Singh Tomar <amittomer25@gmail.com>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Amit Singh Tomar <amittomer25@gmail.com>

MAINTAINERS

@@ -275,6 +275,7 @@ M:	Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
 S:	Maintained
 F:	arch/arm/include/asm/arch-owl/
 F:	arch/arm/mach-owl/
+F:	doc/board/actions/
 F:	drivers/clk/owl/
 F:	drivers/serial/serial_owl.c
 F:	include/configs/owl-common.h

doc/board/actions/cubieboard7.rst

@@ -102,7 +102,7 @@ Building U-BOOT proper image
 
    $ make clean
    $ export CROSS_COMPILE=aarch64-linux-gnu-
-   $ make ARCH=arm cubieboard7_defconfig
+   $ make cubieboard7_defconfig
    $ make u-boot-dtb.img -j16
 
 u-boot-dtb.img can now be flashed to debian image partition mounted on host machine.