UBUNTU: [Config] Fix up s390x config options changed during 4.10 rebase

UBUNTU: [Config] Fix up s390x config options changed during 4.10 rebase

Fix the following options mistakenly changed during the rebase
from 4.9 to 4.10.

 - CONFIG_I2C was selected by CONFIG_SFC_FALCON but should be
   disabled because s390x lacks hw support. Revert these and
   related options, and enforce the CONFIG_I2C values to prevent
   this in the future.

 - Change CONFIG_LPC_SCH from m to n.

 - Change CONFIG_NVMEM from m to n.

 - Change CONFIG_REGULATOR from m to n.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>