Documentation: mips: Update AU1xxx_IDE Kconfig dependencies

IDEDMA_AUTO IDEDMA_PCI_AUTO was removed in commit 120b9cf ("ide: remove CONFIG_IDEDMA_{ICS,PCI}_AUTO config")
BLK_DEV_IDEDISK was removed in commit 806f80a ("ide: add generic ATA/ATAPI disk driver")
BLK_DEV_IDE_AU1XXX_BURSTABLE_ON was removed in commit 8f29e65 ("ide: AU1200 IDE update")
Remove them from documentation

Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/mips/AU1xxx_IDE.README

@@ -56,8 +56,6 @@ Following extra configs variables are introduced:
 
   CONFIG_BLK_DEV_IDE_AU1XXX_PIO_DBDMA    - enable the PIO+DBDMA mode
   CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA  - enable the MWDMA mode
-  CONFIG_BLK_DEV_IDE_AU1XXX_BURSTABLE_ON - set Burstable FIFO in DBDMA
-                                           controller
 
 
 SUPPORTED IDE MODES
@@ -82,28 +80,23 @@ CONFIG_IDE_GENERIC=y
 CONFIG_BLK_DEV_IDEPCI=y
 CONFIG_BLK_DEV_GENERIC=y
 CONFIG_BLK_DEV_IDEDMA_PCI=y
-CONFIG_IDEDMA_PCI_AUTO=y
 CONFIG_BLK_DEV_IDE_AU1XXX=y
 CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA=y
 CONFIG_BLK_DEV_IDEDMA=y
-CONFIG_IDEDMA_AUTO=y
 
 Also define 'IDE_AU1XXX_BURSTMODE' in 'drivers/ide/mips/au1xxx-ide.c' to enable
 the burst support on DBDMA controller.
 
 If the used system need the USB support enable the following kernel configs for
 high IDE to USB throughput.
 
-CONFIG_BLK_DEV_IDEDISK=y
 CONFIG_IDE_GENERIC=y
 CONFIG_BLK_DEV_IDEPCI=y
 CONFIG_BLK_DEV_GENERIC=y
 CONFIG_BLK_DEV_IDEDMA_PCI=y
-CONFIG_IDEDMA_PCI_AUTO=y
 CONFIG_BLK_DEV_IDE_AU1XXX=y
 CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA=y
 CONFIG_BLK_DEV_IDEDMA=y
-CONFIG_IDEDMA_AUTO=y
 
 Also undefine 'IDE_AU1XXX_BURSTMODE' in 'drivers/ide/mips/au1xxx-ide.c' to
 disable the burst support on DBDMA controller.