tty: serial: samsung_tty: drop unneded dbg() calls

Now that the kernel has ftrace, any debugging calls that just do "made
it to this function!" and "leaving this function!" can be removed.

On the quest to move the samsung_tty driver over to use the standard
kernel debugging functions, drop these unneeded calls.

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

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