cm.mk: remove wifi direct

Upstream commit e31df6bd3b7e52d70c1c3c0ab4307b711f12ab68 from
arco's branch.
https://github.com/arco/android_device_htc_buzz/commit/e31df6bd3b7e52d70c1c3c0ab4307b711f12ab68

Not supported in wifi driver.

Change-Id: Idcc4285f653c5c8d81234522297248aa232a3b5a
buzz.mk: add ldpi overlays

Adds the ldpi overlays instead of overwriting them.
Hint taken from the marvel repository at git.cryptomilk.org.

Change-Id: Ibec61632659e94446c719e722742a2cb7570d3f4
buzz.mk: don't copy files to root/

Skips the copy of the wifi module and firmaware files to root/,
it seems that they are not needed there.

Change-Id: I83bef62d0cc442e95cec5aa96e75e788a56c9c5f
buzz.mk: skip libmm-omxcore

There is no (not yet?) such a target in the local buzz repo,
so it won't get built anyway.

Change-Id: I2b17be10dd27a90c5b3d96c50ebb7d9130502e2f
add media_codecs.xml

Adds media_codecs.xml and copies it to system/etc/.
Taken from the marvel repo at git.cryptomilk.org.

Change-Id: I185b4115197bab0ab579798bd2f735dd498c325b
BoardConfig.mk: remove (unneeded?) audio build vars

Removes some vars from the audio build system variables that
are no longer needed. At least, grepping the source did not
turn anything up.

Change-Id: I0b476e7876cfd1d26de47bf95f2745f6adbf6663
recovery.fstab: switch /sd-ext to type auto

Changes the filesystem type of /sd-ext to auto, taken from the marvel
repo at git.cryptomilk.org.

Change-Id: I77439927e366f07833b9fd11a02e90dbe1212200
system.prop: remove net speed "tweaks"

Removes the network speed "tweaks" as I am not a fan of such things in
general and would rather trust linux and the android framework to do
things right by itself.

If someone wants it, one can always edit the final system/build.prop.

Change-Id: Ia96df7aaf7c43239c3a4d070879ad9486f582927