x86/platform: Remove unused get_bios_ebda_length() function

get_bios_ebda_length() uses min_t() without including linux/kernel.h.

This may result in build errors with some configurations. Since the
function is not used anywhere in the kernel, let's just drop it.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Waychison <mikew@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1459558314-5625-1-git-send-email-linux@roeck-us.net


Signed-off-by: Ingo Molnar <mingo@kernel.org>