[IA64] Update default configs

PNP and PNPACPI turned on

    i8042 recently changed from ACPI to PNP detection.  Without PNP, it
    probes legacy I/O ports for the keyboard controller, which causes an
    MCA on HP boxes.

    Also, I'm about to remove 8250_acpi.c, so we'll need PNP to detect
    non-PCI serial ports.  Until 8250_acpi.c is removed, some systems
    will see serial ports reported twice (once from 8250_acpi.c and again
    from 8250_pnp.c).  This is harmless.

    PNPACPI is still marked EXPERIMENTAL, but I'm not aware of any
    outstanding issues on ia64.

IDE_GENERIC turned off (except for SGI simulator, all ia64 IDE is PCI)

    ide-generic probes compiled-in legacy I/O ports for IDE devices, which
    again causes an MCA.  It would be nicer to just get rid of all the
    legacy junk from include/asm-ia64/ide.h, but that is a bit riskier
    because it could break ide-cs and the HDIO_REGISTER_HWIF ioctl
    (http://www.ussg.iu.edu/hypermail/linux/kernel/0508.2/0049.html).

Here's the essence of the patch:

    -# CONFIG_PNP is not set
    +CONFIG_PNP=y
    +CONFIG_PNPACPI=y

    -CONFIG_IDE_GENERIC=y
    +# CONFIG_IDE_GENERIC is not set

Tested on tiger, bigsur, and zx1.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>