Add new variant configuration of it81202cx and it81302cx.
This cx variant of it81xx2 changes are as follows:
1. SRAM size will increase from 60k to 128k.
2. Configurable ILM size is still 60k.
3. Support M extension of RISC-V.
Signed-off-by: Tim Lin <tim2.lin@ite.corp-partner.google.com>
Tim Lin