riscv32: Use medany C model for modules
When CONFIG_CMODEL_MEDLOW is used it ends up generating riscv_hi20_rela
relocations in modules which are not resolved during runtime and
following errors would be seen
[ 4.802714] virtio_input: target
00000000c1539090 can not be addressed by the 32-bit offset from PC =
39148b7b
[ 4.854800] virtio_input: target
00000000c1539090 can not be addressed by the 32-bit offset from PC =
9774456d
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>