Add TYPE_CODE_FIXED_POINT handling in print_type_scalar

Add TYPE_CODE_FIXED_POINT handling in print_type_scalar

This commit enhances print_type_scalar to include support for
TYPE_CODE_FIXED_POINT. This way, any language falling back to
this function for printing the description of some types
also gets basic ptype support for fixed point types as well.

This fixes a couple of XFAILs in gdb.dwarf2/dw2-fixed-point.exp.

gdb/ChangeLog:

        * typeprint.c (print_type_scalar): Add handling of
        TYPE_CODE_FIXED_POINT.

gdb/testsuite/ChangeLog:

        * gdb.dwarf2/dw2-fixed-point.exp: Fix the expected output of
        the "ptype pck__fp1_range_var" test for the module-2 and pascal
        languages.  Remove the associated setup_xfail.