tty: serial: samsung_tty: do not abuse the struct uart_port unused fields

The samsung_tty driver was trying to abuse the struct uart_port by using
two "empty" bytes for its own use.  That's not ok, and was found by
removing those fields from the structure.

Move the variables into the port-specific structure, which is where
everything else for this port already is.  There is no space wasted here
as there was an empty "hole" in the structure already for these bytes.

Cc: Kukjin Kim <[email protected]>
Cc: Hyunki Koo <[email protected]>
Cc: HYUN-KI KOO <[email protected]>
Cc: Shinbeom Choi <[email protected]>
Cc: Krzysztof Kozlowski <[email protected]>
Cc: Dmitry Safonov <[email protected]>
Cc: Jiri Slaby <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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