configs/andes_ae350_45: use BR2_riscv_g
As of upstream commit cbd91e89e43d600172c62fd1cbd33aa74d0a851a
we can use the default BR2_riscv_g to select IMAFD extensions and
still be able to enable additional extensions, such as the C extension
in our cse.
Suggested-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>