kernel: fix arm build

Signed-off-by: Pawel Dziepak <pdziepak@quarnos.org>
kernel/arm: make stack and register dump more readable

Signed-off-by: Pawel Dziepak <pdziepak@quarnos.org>
kernel: fix x86_64 build

Signed-off-by: Pawel Dziepak <pdziepak@quarnos.org>
kernel/x86_64: make {stack, register} dumps more readable

Signed-off-by: Pawel Dziepak <pdziepak@quarnos.org>