drm/xe: Introduce Xe assert macros

As we are moving away from the controversial XE_BUG_ON macro,
relying just on WARN_ON or drm_err does not cover the cases
where we want to annotate functions with additional detailed
debug checks to assert that all prerequisites are satisfied,
without paying footprint or performance penalty on non-debug
builds, where all misuses introduced during code integration
were already fixed.

Introduce family of Xe assert macros that try to follow classic
assert() utility and can be compiled out on non-debug builds.

Macros are based on drm_WARN, but unlikely to origin, disallow
use in expressions since we will compile that code out.

As we are operating on the xe pointers, we can print additional
information about the device, like tile or GT identifier, that
is not available from generic WARN report:

[ ] xe 0000:00:02.0: [drm] Assertion `true == false` failed!
    platform: 1 subplatform: 1
    graphics: Xe_LP 12.00 step B0
    media: Xe_M 12.00 step B0
    display: enabled step D0
    tile: 0 VRAM 0 B
    GT: 0 type 1

[ ] xe 0000:b3:00.0: [drm] Assertion `true == false` failed!
    platform: 7 subplatform: 3
    graphics: Xe_HPG 12.55 step A1
    media: Xe_HPM 12.55 step A1
    display: disabled step **
    tile: 0 VRAM 14.0 GiB
    GT: 0 type 1

[ ] WARNING: CPU: 0 PID: 2687 at drivers/gpu/drm/xe/xe_device.c:281 xe_device_probe+0x374/0x520 [xe]
[ ] RIP: 0010:xe_device_probe+0x374/0x520 [xe]
[ ] Call Trace:
[ ]  ? __warn+0x7b/0x160
[ ]  ? xe_device_probe+0x374/0x520 [xe]
[ ]  ? report_bug+0x1c3/0x1d0
[ ]  ? handle_bug+0x42/0x70
[ ]  ? exc_invalid_op+0x14/0x70
[ ]  ? asm_exc_invalid_op+0x16/0x20
[ ]  ? xe_device_probe+0x374/0x520 [xe]
[ ]  ? xe_device_probe+0x374/0x520 [xe]
[ ]  xe_pci_probe+0x6e3/0x950 [xe]
[ ]  ? lockdep_hardirqs_on+0xc7/0x140
[ ]  pci_device_probe+0x9e/0x160
[ ]  really_probe+0x19d/0x400

v2: use lowercase names
v3: apply xe coding style
v4: fix non-debug build and improve kernel-doc

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Oded Gabbay <ogabbay@kernel.org>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>