ACPI: Simplifications of the GPE-handling code

Hi,

The following patches are intended to simplify the GPE-handling code in ACPICA and the kernel.

[1/6] and [2/6], already posted as https://patchwork.kernel.org/patch/107612/
and https://patchwork.kernel.org/patch/107613/ , respectively, rework the GPE code so that reference counting is only used for GPEs enabled at run time.

[3/6] and [4/6] modify the EC driver so that it doesn't use acpi_set_gpe().

[5/6] modifies acpi_ev_initialize_gpe_block() so that it will use a low-level GPE enabling routine instead of acpi_set_gpe().

Finally, [6/6] removes acpi_set_gpe() which is no longer necessary (and there is a good reason to get rid of it).

Please apply.

Rafael