Pins for UART 3/4 are by default GPIO pins.
This patch sets the pins in UART mode.
Since UART 1/3 and 2/4 share the same interrupt line,
the patch needs to enable also shared interrupts.
Datasheet: Name: F81866D/A-I, Release Date: Jan 2012, Version: V0.12P
Link: http://www.alldatasheet.com/datasheet-pdf/pdf/459085/FINTEK/F81866AD-I.html
Change-Id: Ief5d70c8b25a2fb6cd787c45a52410e20b0eaf2e
Signed-off-by: Fabian Kunkel <fabi@adv.bruhnspace.com>
Reviewed-on: https://review.coreboot.org/15564
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
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