split efi systab in sysfs

[Dave Young]

Hi, Matt and Peter

Currently /sys/firmware/efi/systab contains multi-lines for efi systab
entries. As previous discussion with Greg, this is not a good in sysfs.
I wonder if there's other users for this file except kexec-tools.

If kexec-tools is the only user, maybe I can split it as several files.
In kexec-tools just use /sys/firmware/efi/"$entry_name" and if $entry_name
does not exist then switch to old systab file. 

Thanks
Dave
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