[PATCH][ACPI] Panasonic Hotkey Driver v0.6.3

[Hiroshi M. <mi...@da...>]

Hi,

Bugfix:
v0.6.2 cannot generate hotkey event because pcc_acpi_get_key() does not
return proper value. And it is not handle return value of acpi_bus_register_driver(), too.

Cleanup:
ACPI subsystem has funcion 'acpi_evaluate_integer',
I can replase read_acpi_int by it.

These patchs fix these problems.

# these are generated by bkexport script.