x86: Rename eisa_set_level_irq to elcr_set_level_irq

x86: Rename eisa_set_level_irq to elcr_set_level_irq

This routine has been around for over a decade, but with EISA
being dead and abandoned for about twice that long, the name can
be kind of confusing.  The function is going at the PIC Edge/Level
Configuration Registers (ELCR), so rename it as such and mentally
decouple it from the long since dead EISA bus.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Reviewed-by: Maciej W. Rozycki <macro@linux-mips.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Len Brown <len.brown@intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: x86@kernel.org
Link: http://lkml.kernel.org/r/1431217657-934-1-git-send-email-paul.gortmaker@windriver.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>