linux-libre-aarch64: use gcc-initial for now

- Compiling a toolchain takes time.
- We also need to make sure to get the toolchain right, usually it
  requires 3 steps (gcc-initial, gcc-intermediate, gcc-final) and
  here we're trying to do it in two to save compilation time.
- The 2 step toolchain worked for newlib but we don't know PKGBUILD
  examples that do that for glibc based toolchains.
- We don't need a libc to build Linux.

Because of all that, we depends on the aarch64 gcc-initial toolchain
for building it now.

Once we have pushed aarch64 gcc, we will need to add it again as
a dependency for building this pacakge, in order to be able to build
this package and aarch64 userspace applications as well with the same
compiler.

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

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