Defconfig changes for omaps for v4.21 merge window

We're finally changing omaps to use 8250_OMAP instead of SERIAL_OMAP
for multi_v7_defconfig. This will make things much easier for distros,
and the kernel already warns about the kernel console getting
redirected with CONFIG_SERIAL_8250_OMAP_TTYO_FIXUP defaulting to y.

People using /etc/inittab still need to s/ttyO/ttyS/ if using the
out-of-box multi_v7_defconfig, and that did not seem to be an issue
when we moved omap2plus_defconfig to use 8250_OMAP earlier.

The other change is to enable CONFIG_SND_SOC_TLV320AIC23_I2C as a
loadable module that I forgot to send a pull request for earlier.
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