x86: kconfig: Remove meaningless 'select n'

x86: kconfig: Remove meaningless 'select n'

'select n' selects a constant symbol, which is meaningless and has no
effect. Maybe this was meant to be a 'default n', though bool and
tristate symbols already implicitly default to n.

Discovered in Kconfiglib (https://github.com/ulfalizer/Kconfiglib),
which does more strict checking here:

	kconfiglib.KconfigSyntaxError: board/google/Kconfig:34: Couldn't parse '	select n': expected nonconstant symbol

Signed-off-by: Ulf Magnusson <ulfalizer@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>