drm/amdgpu: Fix return type in 'aca_bank_hwip_is_matched()'

Change the return type of "if (!bank || type == ACA_HWIP_TYPE_UNKNOW)"
to be bool instead of int.

Fixes the below:
drivers/gpu/drm/amd/amdgpu/amdgpu_aca.c:185 aca_bank_hwip_is_matched() warn: signedness bug returning '(-22)'

Fixes: f5e4cc84 ("drm/amdgpu: implement RAS ACA driver framework")
Cc: Yang Wang <kevinyang.wang@amd.com>
Cc: Hawking Zhang <Hawking.Zhang@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Reviewed-by: Yang Wang <kevinyang.wang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>