[RFC] [Patch Try 3] U-Boot-V2: ARM: Add ARCH lowlevel Init

[Menon_Nishanth]

This Patch adds CONFIG_ARCH_HAS_LOWLEVEL_INIT as discussed in thread
http://www.nabble.com/-Patch--U-Boot-V2%3A-Introduce-CONFIG_ARCH_HAS_INIT_LOWLEVEL-to17134638.html#a17188894

Signed-off-by: Nishanth Menon<x0nishan@ti.com>