Add support for an automounter that will automatically mount and unmount a file system a media is inserted and removed

SAMA5D4-EK: Add logic to disable the faulty PMIC.  This must be done with JP23 open.  It is perfomed only from the DRAMBOOT loader

PCM: Major simplification of the sub-sampling design.  Now need no extra buffers because sub-sampling is done in place

NxPlayer needs to set curbyte field to zero before enqueuing a buffer.  Otherwise, it looks like beginning of the buffer has already been consumed

Change naming from cp_XYZ_cache() to arch_XYP_cache() so that all cache operations will pick up L2 support if it is enabled

 New cache.h file.  Renames cp15_XYZ_cache() to arch_XYZ_cache() and addes L2 cache support if L2 cache is enabled

 Rename ARMv7-A cache.h to cp15_cache.h.  Things will be broken on this commit until I get the new cache.h in place.

arch/arm/src/armv7-a/arm_l2cc_pl310.c, l2cc.h, l2cc_pl310.h, Kconfig:  Add initiali support for the ARM L2CC-PL310 L2 cache.