Changes to allow the font subsystem to be built without enabling the entire graphics system (CONFIG_NX).  Adds CONFIG_NXFONTS and CONFIG_NXGLIB.  NX and NXFONTS are still pretty heavily entangled

Squashed commit of the following:

    libnx: Need to duplicate some Kconfig setting for NXFONTs if it can be configured and built independently of NX.  Also includes some build-related fixes.

    configs/sim:  Disable NX graphics support in the fb configuration.

    libnx:  Basic configuration and build changes to support building font support independend of the NX server.

Make system: Build the drivers/ directory even if file descriptors are disabled.  There are still things that may be needed from the drivers/ director (such as SYSLOG logic or lower half drivers).

boardctl(): Add a new non-standard OS interface.  This is similar to a driver IOCTL call.  But this is an IOCTL call directly on the board logic.  This function will eventually replace all of the ad hoc OS interfaces that are current used to perform application specific intialiation and application driver test confifuration.  It essentially formalizes and institutionalizes these rogue interface in to at least a single crazy call.

Separate flat, protected, and kernel mode library selected into separate files.  The conditional logic as exceed my able to comprehend and maintain the selections.