nds32: add a Kconfig symbol for LOCKDEP_SUPPORT

nds32: add a Kconfig symbol for LOCKDEP_SUPPORT

Each architecture (arch/) should define its own LOCKDEP_SUPPORT
Kconfig symbol (if it is needed). arch/nds32/ is the only one
that does "select LOCKDEP_SUPPORT", which is basically a no-op
since the symbol is not defined. (It might be nice for kconfig
to warn about that.)

Add a "config LOCKDEP_SUPPORT" to arch/nds32/Kconfig to correct
this issue.

Since the current Kconfig file selects LOCKDEP_SUPPORT unconditionally,
use "def_bool y" to set/enable it always.

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Nick Hu <nickhu@andestech.com>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Vincent Chen <deanbo422@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greentime Hu <green.hu@gmail.com>