platform/x86: hp-wmi: Add support for Fn+P hotkey

Add support for the Fn+P hotkey found on newer HP Victus (and probably
newer Omen) laptops. This hotkey is intended for use with Omen Gaming Hub
to change the performance profile (see [1]).

Pressing Fn+P under linux produced the following warning in dmesg:

> hp_wmi: Unknown event_id - 27 - 0x7

Implemented a handling for this event so that the hotkey cycles between the
platform profiles when triggered.

Tested on Victus 16-s1011nt (9Z791EA, MB 8C9C).

Changes in v2:
- Make the key just switches between platform profiles instead of
  assigning a key event code.
- v1: https://lore.kernel.org/all/20250802213541.18791-2-edip@medip.dev/

[1]: https://jpcdn.it/img/adadf6c927ffeb75afd8038f95db400a.png

Signed-off-by: Edip Hazuri <edip@medip.dev>
Link: https://lore.kernel.org/r/20250814204529.18467-4-edip@medip.dev
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

Author: Vilez0

drivers/platform/x86/hp/hp-wmi.c

@@ -122,6 +122,7 @@ enum hp_wmi_event_ids {
 	HPWMI_BATTERY_CHARGE_PERIOD	= 0x10,
 	HPWMI_SANITIZATION_MODE		= 0x17,
 	HPWMI_CAMERA_TOGGLE		= 0x1A,
+	HPWMI_FN_P_HOTKEY		= 0x1B,
 	HPWMI_OMEN_KEY			= 0x1D,
 	HPWMI_SMART_EXPERIENCE_APP	= 0x21,
 };
@@ -981,6 +982,9 @@ static void hp_wmi_notify(union acpi_object *obj, void *context)
 						key_code, 1, true))
 			pr_info("Unknown key code - 0x%x\n", key_code);
 		break;
+	case HPWMI_FN_P_HOTKEY:
+		platform_profile_cycle();
+		break;
 	case HPWMI_OMEN_KEY:
 		if (event_data) /* Only should be true for HP Omen */
 			key_code = event_data;