[PATCH] fix error on drivers/ata/pata_legacy.c

[Zhenwen Xu]

fix those errors:

drivers/ata/pata_legacy.c: In function âpdc_data_xfer_vlbâ:
drivers/ata/pata_legacy.c:289: error: âapâ undeclared (first use in this function)
drivers/ata/pata_legacy.c:289: error: (Each undeclared identifier is reported only once
drivers/ata/pata_legacy.c:289: error: for each function it appears in.)
drivers/ata/pata_legacy.c: At top level:
drivers/ata/pata_legacy.c:869: error: âATA_PFLAG_PIO32_CHANGEâ undeclared here (not in a function)
make[2]: *** [drivers/ata/pata_legacy.o] Error 1
make[1]: *** [drivers/ata] Error 2