Allow registering ACPI interrupt handlers with a xname.
AcpiOsInstallInterruptHandler(), part of ACPICA API, doesn't allow passing
the xname. I extend the API with AcpiOsInstallInterruptHandler_xname()
for this purpose, and change acpi_md_OsInstallInterruptHandler() to
accept and use the xname (ia64 doens't use it).
The xname was hardcoded to "acpi SCI" in the
x86 acpi_md_OsInstallInterruptHandler(), so I make
AcpiOsInstallInterruptHandler() call
AcpiOsInstallInterruptHandler_xname with xname = "acpi SCI".

Now 'vmstat -i' shows the device's name instead of "acpi SCI" for for i2c HID
interrupts.

Proposed on tech-kern@ on Dec 29.

branches: 1.8.62;
Switch to ACPICA 20090730, and update for API changes.

branches: 1.7.10;
__FUNCTION__ -> __func__

branches: 1.6.18; 1.6.26; 1.6.30;
Initialize acpi_interrupt_list_mtx in acpi_probe().

Forgot to initialize the mutex.

Replace ACPI_INTERRUPT_LIST_{LOCK,UNLOCK} mutex_{enter,exit}

Replace simple_locks with mutexes, reviewed by ad@.

branches: 1.2.4; 1.2.10;
Delete unsigned comparison with < 0

branches: 1.1.2; 1.1.4; 1.1.6; 1.1.8; 1.1.14;
Move from sys/dev/acpi/acpica/Osd.