distro/angstrom.conf: Use OE-Core gcc toolchain
distro/angstrom.conf: Use OE-Core gcc toolchain

most of arm stuff is upstream now a days therefore
switch to use OE-Core toolchain always

Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>

Angstrom-distribution/meta-angstrom,Angstrom-distribution/meta-angstrom,Angstrom-distribution/meta-angstrom,Angstrom-distribution/meta-angstrom