lm32: Use free_reserved_area helpers

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
lm32: Put signal trampoline in static code

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
lm32: Directly link against libgcc

Instead of copying files from libgcc over just directly link against libgcc.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
milkymist-timer: Use clockevents_config_and_register()

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>