soc: riscv-ite: fix __soc_handle_irq

Save ra to caller saved register is wrong because it might get
overwritten after another function is called, so we fix this.

Remove clear mip register operation. (it8xxx2 supports machine-mode
only, and MEIP bit of mip is read-only).

Signed-off-by: Dino Li <Dino.Li@ite.com.tw>
1 file changed