[*] Build: Fix dependencies in main Makefile

Signed-off-by: Anton Sergeev <Anton.Sergeev@elecard.ru>
[*] Buildroot: Add support for skiping copying elecard publick key. Add additional search dir for keys.

Signed-off-by: Anton Sergeev <Anton.Sergeev@elecard.ru>
[*] Kernel: Include uinput driver into rootfs

Signed-off-by: Anton Sergeev <Anton.Sergeev@elecard.ru>
[+] initramfs: Add openssl by default

Signed-off-by: Anton Sergeev <Anton.Sergeev@elecard.ru>
[*] Kernel: Add support for PromSvyaz.2 board

Signed-off-by: Anton Sergeev <Anton.Sergeev@elecard.ru>