keystone-evm: update serial port and virtual terminal settings
keystone-evm: update serial port and virtual terminal settings

Keystone uses the old ttyS0 serial name instead of the new ttyO0.
Also disable spawning gettys on virtual terminals.

Signed-off-by: Denys Dmytriyenko <d29de71aea38aad3a87d486929cb0aad173ae612@ti.com>

floft/meta-ti,RedFIR/meta-ti,joelagnel/meta-ti,RedFIR/meta-ti,jumpnow/meta-ti,joelagnel/meta-ti,floft/meta-ti,rcn-ee/meta-ti,treideme/meta-ti-rt,RedFIR/meta-ti,rcn-ee/meta-ti,jumpnow/meta-ti,rcn-ee/meta-ti,tylerwhall/meta-ti,smoosvi/Test4,RedFIR/meta-ti,joelagnel/meta-ti,rcn-ee/meta-ti,joelagnel/meta-ti,tylerwhall/meta-ti,Angstrom-distribution/meta-ti,smoosvi/Test4,tylerwhall/meta-ti,treideme/meta-ti-rt,Angstrom-distribution/meta-ti,tylerwhall/meta-ti