ar71xx: improve kernel support for the TL-MR3040 v2

This patch adds support for the hardware slide switch on
the TL-MR3040 v2.

Signed-off-by: Mads Hansen <d@taba.se>
[juhosg: use EV_SW instead of EV_KEY]
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38190 3c298f89-4303-0410-b956-a3cf2f4a3e73
ar71xx: add user-space support for TL-MR3040 v2

Signed-off-by: Mads Hansen <d@taba.se>
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38191 3c298f89-4303-0410-b956-a3cf2f4a3e73
ar71xx: use correct board id for TL-MR3040 v2

Fix the image building code so that the kernel correctly
distinguishes between hardware revisions.

Signed-off-by: Mads Hansen <d@taba.se>
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38192 3c298f89-4303-0410-b956-a3cf2f4a3e73