cortexa{7,15,17}: add VFPv4 tunes

cortexa{7,15,17}: add VFPv4 tunes

* it was added only to hf cortexa7 in:
  commit e97d152ca13556b41a236c1a4cfb11e77ff857d7
  Author: Kristof Robot <krirobo@gmail.com>
  Date:   Sun Jan 26 10:03:56 2014 +0100

      Add Cortex A7 support for NEONv2 & FPv4

* add it to softfp cortexa7 and both versions for cortexa15 and
  cortexa17 tunes

(From OE-Core rev: 109c26d99b6324c1412f440fef85f090518f6da0)

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>