ACPI: EC: Ignore ECDT tables with an invalid ID string

ACPI: EC: Ignore ECDT tables with an invalid ID string

On the MSI Modern 14 C5M the ECDT table contains invalid data:

	UID : 00000000
 GPE Number : 00	/* Invalid, 03 would be correct */
   Namepath : ""	/* Invalid, "\_SB.PCI0.SBRG.EC" would
			 * be correct
			 */

This slows down the EC access as the wrong GPE event is used for
communication. Additionally the ID string is invalid.

Ignore such faulty ECDT tables by verifying that the ID string has
a valid format.

Tested-by: glpnk@proton.me
Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Link: https://patch.msgid.link/20250529235310.540530-1-W_Armin@gmx.de
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>