Rename pwm_devinit() to board_pwm_setup().  Add CONFIG_BOARDCTL_PWMTEST that will enable calling board_pwm_setup() from boardctl().  Replace calls to pwm_devinit() in apps/examples/pwm with calls to boardctl().  In all configurations that enable the apps/examples/pwm test, make sure that boardctl() suppoprt is properly enabled.

Update several defconfig files.  Make sure that every defconfig file that requires external graphics initialization also approprietly initializes boardctl().

Rename up_nxdrvinit() to board_graphics_setup().  Add CONFIG_BOARDCTL_GRAPHICS that will enabled calls to board_graphics_setup() from boardctrl().  In apps/ and NxWidgts/, replace all calls to up_nxdrvinit with calls to boardctl().

Rename adc_devinit() to board_adc_setup().  Add support to the boardctl() interface so that it can call board_adc_setup() on behalf of an application.  Change apps/examples/adc to that is now calls boardctl() instead of adc_devinit() in order to initalize the ADC device.

rch_tcinitialize() and arch_tcunitinitialize() renamed to board_tsc_setup() and board_tsc_teardown().  These are not long called directly by applications but only indirectly throught the crappy boardctl() OS interface.

NSH initialization now calls boardctl(BOARDIOC_INIT) instead of board_app_initaliaze.  Modify all configurations:  Make sure that CONFIG_LIB_BOARDCTL=y appears wherever CONFIG_NSH_ARCHINIT=y appears.  Remove support for CONFIG_NSH_ARCHMAC.  It is not used and there are better ways to do that operation

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.

SAMV71-XULT: Add option to support connection of the maXTouch Xplained Pro on the 50-pin LCD connector

SAMV7 Ethernet:  I- and D-Cache are now enabled in the netnsh/ configuration.  D-Cache is enabled in write-though mode.  This mode is necessary because the DMA descriptors are each 8-bytes in size but the D-Cache cache line is 32-bits in size. So it is impossible make coherency for every 8-byte DMA descriptor without write-through.

SAMV7 EMAC: Fix alignment issue: RX buffers need to be invalidated.  This means the alignment of buffers must be at least to the data cache line size at both ends of the buffer

SAMV7 EMAC: Sometimes TX is not started when TSTART is set??? Workaround seems to be to set it twice.  Restored full optimization.  Also CONFIG_NET_NOINTS is set so that interrupt level provessing is avoided

SAMV7: Add framework for USB DCD.  Initial check-in is just the SAMA5 USB DCD with naming changes to get a clean compilation.  Needs careful review and comparison with datasheet and, of course, testing