NVIC: Adjust priority setting

Cortex-m0 we supports 2 bit priorities for the NVIC, yet we clear with 0x7 (3
bits). Change so we now clear with 0x3

Also limited priority to the max available (so we don't set extra bits we don't
want or modulus the priority, otherwise setting priority 8 will actual give you
priority 0) in both cortex-m and cortex-m0.

BUG=None, discovered while looking at the code
TEST=Should be no functional change, NVIC priorities should still work the same.
BRANCH=None

Change-Id: I31ba041449cae96983753b297e2631c310a406c4
Signed-off-by: Alexandru M Stan <amstan@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/236086
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>

0 files changed, 0 insertions, 0 deletions