This change adds a helper macro POWER_OF_2 that is useful for calculating the requested power of 2. Change-Id: Ie70f93b6ac175699c11cae7d8f023a52cce01e88 Signed-off-by: Furquan Shaikh <furquan@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/39881 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org>