gdb/nds32: Use type_align instead of nds32_type_align

gdb/nds32: Use type_align instead of nds32_type_align

The general type_align method should be a suitable alternative to
nds32_type_align, so switch to use that.

The only change this will introduce is related to static fields in a
struct or union, the existing code doesn't take account of static
fields when computing the alignment for structs of unions, though this
is probably a bug - which would probably be exposed by the test case
gdb.cp/many-args.exp, though I don't have any way to test this target
right now.

gdb/ChangeLog:

	* nds32-tdep.c (nds32_type_align): Delete.
	(nds32_push_dummy_call): Use type_align instead.