Use lock_api to pass the kernel's lock to an external library.
A multi-core scheduler is composed of a basic scheduler and supports
stealing tasks from other cores.

add lock_api support for kernel-sync

1. add eh_frame section in link.ld
2. update dep

1. update rtc driver impl
2. update syscall-table impl

1. plic is now a standalone module

1. update bitmap impl
2. fix bugs about buddy impl

update dep

1. fix bugs about pread/pwrite
2. add copy_file_range support