sparc: don't reference obsolete termio struct for TC* constants

sparc: don't reference obsolete termio struct for TC* constants

Similar in nature to commit ab107276607a ("powerpc: Fix struct termio related ioctl macros").

glibc-2.42 drops the legacy termio struct, but the ioctls.h header still
defines some TC* constants in terms of termio (via sizeof). Hardcode the
values instead.

This fixes building Python for example, which falls over like:
  ./Modules/termios.c:1119:16: error: invalid application of 'sizeof' to incomplete type 'struct termio'

Link: https://bugs.gentoo.org/961769
Link: https://bugs.gentoo.org/962600
Signed-off-by: Sam James <sam@gentoo.org>
Reviewed-by: Andreas Larsson <andreas@gaisler.com>
Signed-off-by: Andreas Larsson <andreas@gaisler.com>