drm/amdgpu: Fix spelling mistake "Heterogenous" -> "Heterogeneous"

There is a spelling mistake in a comment in the Kconfig. Fix it.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdkfd/Kconfig

 # SPDX-License-Identifier: MIT
 #
-# Heterogenous system architecture configuration
+# Heterogeneous system architecture configuration
 #
 
 config HSA_AMD