device: acpi_name() should take a const struct device

There's no reason to mutate the struct device when determining
the ACPI name for a device. Adjust the function pointer
signature and the respective implementations to use const
struct device.

Change-Id: If5e1f4de36a53646616581b01f47c4e86822c42e
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/21527
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
diff --git a/src/drivers/i2c/hid/hid.c b/src/drivers/i2c/hid/hid.c
index 9eb56c2..71d70d0 100644
--- a/src/drivers/i2c/hid/hid.c
+++ b/src/drivers/i2c/hid/hid.c
@@ -37,7 +37,7 @@
 	i2c_generic_fill_ssdt(dev, &i2c_hid_fill_dsm, &config->generic);
 }
 
-static const char *i2c_hid_acpi_name(struct device *dev)
+static const char *i2c_hid_acpi_name(const struct device *dev)
 {
 	static char name[5];
 	snprintf(name, sizeof(name), "H%03.3X", dev->path.i2c.device);