gdb/dwarf: remove unnecessary parameters to create_{cus,debug_type}_hash_table

In create_cus_hash_table, we can get the section and hash table from the
dwo_file directly.

In create_debug_type_hash_table, we can get the hash table from the
dwo_file directly - the section varies.

Change-Id: I1d5ef49df98fe2620e12b83484b28cd7398f24ae
Approved-By: Tom Tromey <tom@tromey.com>
1 file changed