ARC: [plat*] move code out of .init_machine into common

All the platforms do the same thing in init_machine callback so move it
out of callback into caller of callback

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

diff --cc arch/arc/Kconfig
Simple merge

diff --cc arch/arc/kernel/setup.c
Simple merge

diff --cc arch/arc/plat-arcfpga/platform.c
Simple merge

diff --cc arch/arc/plat-tb10x/Kconfig
Simple merge

diff --cc arch/arc/plat-tb10x/tb10x.c
Simple merge