zephyr: brya: Convert HOOK_INIT to SYS_INIT
zephyr: brya: Convert HOOK_INIT to SYS_INIT

Convert HOOK_INIT to the equivalent SYS_INIT call.

BUG=b:226434387
BRANCH=none
TEST=zmake testall

Signed-off-by: Keith Short <f6d578f97033c25f1206cb57d52f358974c82954@chromium.org>
Change-Id: If4a3dca9c8ec920946589c717599d3db51838cf1
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3553842
Reviewed-by: Abe Levkoy <2e1ad7039298f93262cf06bbb457275fb3e2ecb5@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec