blackfin,kgdb,probe_kernel: Cleanup probe_kernel_read/write

blackfin,kgdb,probe_kernel: Cleanup probe_kernel_read/write

Blackfin needs it own arch specific probe_kernel_read() and
probe_kernel_write().

This was moved out of the kgdb code and into the
arch/blackfin/maccess.c, because it is a generic kernel api.

The arch specific kgdb.c for blackfin was cleaned of all functions
which exist in the kgdb core that do the same thing after resolving
the probe_kernel_read() and probe_kernel_write().  This also
eliminated the need for most of the #include's.

CC: Sonic Zhang <[email protected]>
Signed-off-by: Jason Wessel <[email protected]>
Signed-off-by: Mike Frysinger <[email protected]>