Misc ti_pci1410a fixups

Removed do_pinit() - now declared in cmd_pcmcia.c

Added #define CONFIG_CMD_PCMCIA around pcmcia_off() in line with other
PCMCIA drivers

signed/unsigned type fixups

Added semi-colon after default: label as required by newer gcc

The only board that appears to use this driver is the sc520_spunk which
is very old and very likely very broken anyway. I do not have one to test
whether this patch breaks anything functionaly, I have can only check
that it compiles without warning or error

Signed-off-by: Graeme Russ <graeme.russ@gmail.com>