fu540: 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: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Palmer Dabbelt <palmer@sifive.com>
Cc: Anup Patel <anup.patel@wdc.com>
Cc: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/board/sifive/fu540/MAINTAINERS b/board/sifive/fu540/MAINTAINERS
index 5381fc0..2762072 100644
--- a/board/sifive/fu540/MAINTAINERS
+++ b/board/sifive/fu540/MAINTAINERS
@@ -5,5 +5,6 @@
 M:	Atish Patra <atish.patra@wdc.com>
 S:	Maintained
 F:	board/sifive/fu540/
+F:	doc/board/sifive/fu540.rst
 F:	include/configs/sifive-fu540.h
 F:	configs/sifive_fu540_defconfig
diff --git a/doc/board/sifive/fu540.rst b/doc/board/sifive/fu540.rst
index 610ba87..43402cb 100644
--- a/doc/board/sifive/fu540.rst
+++ b/doc/board/sifive/fu540.rst
@@ -39,7 +39,6 @@
 
 .. code-block:: none
 
-   export ARCH=riscv
    export CROSS_COMPILE=<riscv64 toolchain prefix>
 
 3. make sifive_fu540_defconfig