tty: atmel_serial: define macro for RX size

It is repeated in the code and there is also a big warning by
ATMEL_SERIAL_RINGSIZE. So define ATMEL_SERIAL_RX_SIZE and use it
appropriatelly.

The macro uses array_size() and kmalloc_array() is switched to
kmalloc().

Signed-off-by: Jiri Slaby (SUSE) <[email protected]>
Cc: Richard Genoud <[email protected]>
Cc: Nicolas Ferre <[email protected]>
Cc: Alexandre Belloni <[email protected]>
Cc: Claudiu Beznea <[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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