x86/build: Drop unused mflags-y

Subarchitecture support (mflags-y) was removed from x86 in this commit:

   6bda2c8b ("x86: remove subarchitecture support")

So drop the mflags-y usage from the Makefile.

Signed-off-by: Cao jin <caoj.fnst@cn.fujitsu.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1502105384-23214-1-git-send-email-caoj.fnst@cn.fujitsu.com


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