serial: pxa: Make local functions static

Make functions that are local-only static, so no hairy symbols
stick out of the serial_pxa driver file.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: Tom Rini <trini@ti.com>
1 file changed