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a new physmem.c file. The new code provides helper routines that can be used by legacy SoCs and newer FDT-based systems. There are routines to add one or more regions of physically contiguous ram, and exclude one or more physically contiguous regions of ram. Ram can be excluded from crash dumps, from being given over to the vm system for allocation management, or both. After all the included and excluded regions have been added, arm_physmem_init_kernel_globals() processes the regions into the global dump_avail and phys_avail arrays and realmem and physmem variables that communicate memory configuration to the rest of the kernel. Convert all existing SoCs to use the new helper code.
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