uboot-phytec

keystone2: use CONFIG_SOC_KEYSTONE in common places

Use CONFIG_SOC_KEYSTONE in common places instead of defining
a lot of "if def .. || if def " for different Keystone2 SoC types.

Acked-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@ti.com>