forked from Mirrors/opensbi

To initialize PLIC in sane state, we should: 1. set maximum threshold value of M-mode PLIC contexts 2. set maximum threshold value of S-mode PLIC contexts 3. set irq priorities to miniumum Fix the comment and initialize the threshold/priorities correctly. Signed-off-by: Anup Patel <anup.patel@wdc.com> Signed-off-by: Atish Patra <atish.patra@wdc.com>