* x86-64-linux-nat.c (amd64_linux_gregset64_reg_offset): Rename

* x86-64-linux-nat.c (amd64_linux_gregset64_reg_offset): Rename
from x86_64_linux_gregset64_reg_offset.
(amd64_linux_gregset32_reg_offset): Rename from
x86_64_linux_gregset64_reg_offset.
(amd64_linux_dr_get): Renamed from x86_64_linux_dr_get.
(amd64_linux_dr_set): Renamed from x86_64_linux_dr_set.
(amd64_linux_dr_set_control): Renamed from
x86_64_linux_dr_set_control.  Adjust for renamed functions.
(amd64_linux_dr_set_addr): Renamed from x86_64_linux_dr_set_addr.
Adjust for renamed functions.
(amd64_linux_dr_reset_addr): Renamed from
x86_64_linux_dr_reset_addr. Adjust for renamed functions.
(amd64_linux_dr_get_status): Renamed from
x86_64_linux_dr_get_status.  Adjust for renamed functions.
(_initialize_amd64_linux_nat): Renamed from
_initialize_x86_64_linux_nat.  Adjust for renamed variables and
functions.
* config/i386/nm-x86-64linux.h: Update copyright year.
Adjust for renamed functions.