xserver-xorg-conf: htcdream: switch to htcdream version of the US keyboard

xserver-xorg-conf: htcdream: switch to htcdream version of the US keyboard

The htcdream has an hardware keyboard with some key binded to
  alt+key,for instance alt+q should produce a Tab.

Before we didn't activate that feature, and instead we used
  the US keyboard default.

This feature depend on xkeyboard-config_git which is the default
  for most openembedded based distributions now.

This change only affect the htcdream's xorg.conf and PR was bumped.

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@no-log.org>