linux-wandboard: update defconfig file

Update the wandboard defconfig file to reflect a closer alignment to
the default configurations of the Freescale reference boards.  Here
is a high-level summary of changes:

    - Disable SWAP, as we do not have a swap partition
    - Enable/disable certain ARM errata workarounds
    - Enable audio and SGTL5000
    - Build all cpufreq modes
    - Touchscreen and keyboard input support
    - DRM support converted from built-in to modules
    - Added some USB gadget support
    - Added default crypto options and hardware crypto support (FSL CAAM)

Signed-off-by: John Weber <rjohnweber@gmail.com>