hwdb: Add mapping for ACPI quickstart keys on Toshiba Z830

hwdb: Add mapping for ACPI quickstart keys on Toshiba Z830

The Toshiba Z830 has 3 hotkeys which use the ACPI PNP0C32 quickstart spec:
https://archive.org/details/microsoft-acpi-dirapplaunch

These devices have an ACPI method called GHID() which suggests
it returns a value from the "HID Usage Tables" document, but these
methods simple returns a follow number for the button (1, 2 and 3).

The first 2 buttons are for what the manual calls "TOSHIBA eco button"
and "TOSHIBA Presentation button", since there is no good match for
these simply map them to KEY_PROG1 and KEY_PROG2.

The third button is intended to toggle the touchpad on/off, map
this to F21 which GNOME/KDE will interpret as touchpad toggle.