classes/kernel-fitimage: add ability to sign individual images
Add the ability to have the kernel, dtb and ramdisk individually signed
by setting FIT_SIGN_INDIVIDUAL = "1". This could be useful if you are
intending to verify signatures before using kexec for example.
Signed-off-by: Luca Boccassi <luca.boccassi@microsoft.com> Signed-off-by: Paul Eggleton <paul.eggleton@microsoft.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
