BugLink: http://bugs.launchpad.net/bugs/1546572

drivers/gpu/drm/amd/amdgpu/../powerplay/hwmgr/tonga_hwmgr.c:2653:9-10: WARNING: return of 0/1 in function 'is_pcie_gen2_supported' with return type bool
drivers/gpu/drm/amd/amdgpu/../powerplay/hwmgr/tonga_hwmgr.c:2645:9-10: WARNING: return of 0/1 in function 'is_pcie_gen3_supported' with return type bool

 Return statements in functions returning bool should use
 true/false instead of 1/0.
Generated by: scripts/coccinelle/misc/boolreturn.cocci

CC: yanyang1 <young.yang@amd.com>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 62a03f6d)
Signed-off-by: Alberto Milone <alberto.milone@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>