drm/amdgpu: Fix ISP HW init issue

ISP hw_init is not called with the recent changes related
to hw init levels. AMDGPU_INIT_LEVEL_DEFAULT is ignoring
the ISP IP block as AMDGPU_IP_BLK_MASK_ALL is derived using
incorrect max number of IP blocks.

Update AMDGPU_IP_BLK_MASK_ALL to use AMD_IP_BLOCK_TYPE_NUM
instead of AMDGPU_MAX_IP_NUM to fix the issue.

Fixes: 14f2fe34 ("drm/amdgpu: Add init levels")
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Pratap Nirujogi <pratap.nirujogi@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>