sata_sil3114: fix compiler warning

judging from other printfs in the same file, it seems ata should be
postpended with the interface number, not the address of the global
port variable.  Fixes this for current u-boot-mpc83xx tree:

Configuring for MPC8349ITX board...
sata_sil3114.c: In function 'sata_bus_softreset':
sata_sil3114.c:99: warning: format '%u' expects type 'unsigned int', but argument 2 has type 'struct sata_port *'
sata_sil3114.c:108: warning: format '%u' expects type 'unsigned int', but argument 2 has type 'struct sata_port *'

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>