tcmode-default.inc: Adjust for new toolchain component changes

Recently we renames the cross compilers as well as spun out
libgcc-initial from gcc-initial out. We need to also express
it in default tcmode otherwise defining GCCVERSION and/or BINUVERSION
outside OE-Core does not cover all cases

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>