ec/acpi/ec.c: Use __func__

Change-Id: I4823b84d851d7d1f0f48be44ab28e7365b553b6f
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49553
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by:  Felix Singer <felixsinger@posteo.net>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>

src/ec/acpi/ec.c

@@ -84,7 +84,7 @@ u8 recv_ec_data(void)
 	udelay(10);
 
 	data = inb(ec_data_reg);
-	printk(BIOS_SPEW, "recv_ec_data: 0x%02x\n", data);
+	printk(BIOS_SPEW, "%s: 0x%02x\n", __func__, data);
 
 	return data;
 }