yocto-bsp: Update substrate to use the new x86 tune files

yocto-bsp: Update substrate to use the new x86 tune files

Update the substrates to use x86-base instead of ia32-base and core2-64
instead of x86-64. Update the core2 bit to include the DEFAULTTUNE to be
explicit.

(From meta-yocto rev: 3ccc079192ca147382231f0379bae1d04d47a89c)

Signed-off-by: Darren Hart <dvhart@linux.intel.com>
Cc: Richard Purdie <richard.purdie@linuxfoundation.org>
Cc: Paul Eggleton <paul.eggleton@intel.com>
Cc: Tom Zanussi <tom.zanussi@intel.com>
Cc: Nitin Kamble <nitin.a.kamble@intel.com>
Cc: Mark Hatle <mark.hatle@windriver.com>
Cc: Bruce Ashfield <bruce.ashfield@windriver.com>
Cc: Martin Jansa <martin.jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>