arm/arch-arm*: define ARMPKGARCH_tune-* for default tunes
* tune-foo is not valid override, for it to work I had to add
ARMPKGARCH = "${ARMPKGARCH_tune-${DEFAULTTUNE}}"
but that doesn't work without value defined for every supported
DEFAULTTUNE value, otherwise it's expanded like this
TUNE_PKGARCH (${ARMPKGARCH_tune-armv5te}te).
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
