hwmon: remove amd_energy driver in Makefile

hwmon: remove amd_energy driver in Makefile

Commit 9049572fb145 ("hwmon: Remove amd_energy driver") removes the driver,
but misses to adjust the Makefile.

Hence, ./scripts/checkkconfigsymbols.py warns:

SENSORS_AMD_ENERGY
Referencing files: drivers/hwmon/Makefile

Remove the missing piece of this driver removal.

Fixes: 9049572fb145 ("hwmon: Remove amd_energy driver")
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Link: https://lore.kernel.org/r/20210817084811.10673-1-lukas.bulwahn@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>