Introduce a new function change_default_kernel() to change the default
boot kernel, which is defined as "default-kernel" in lat.yaml file.
Either build-image --std or build-image --rt uses the same pkg list
file(stx-std.lst), no longer maintain stx-rt.lst. All the rt packages
are merged into stx-std.lst, so always pass "std" to function
check_stx_patched() to select stx-std.lst file.
The --std or --rt of build-image changes to set the default booting
kernel.
Test Plan:
Pass: build-image --std
Pass: boot up, uname -a shows up std kernel
Pass: change to rt kernel in /boot/1/kernel.env
Pass: reboot, uname -a shows up rt kernel
Pass: build-image --rt
Pass: boot up, uname -a shows up rt kernel
Pass: change to std kernel in /boot/1/kernel.env
Pass: reboot, uname -a shows up std kernel
Story: 2008846
Task: 45417
Signed-off-by: Yue Tao <Yue.Tao@windriver.com>
Change-Id: I784aefd540ab334c460e9f136910da9ac6b86209
21edf8072c