Zephyr: fix log filtering

[marc-hb]

Fixes#5032.

Hard-dependency on zephyrproject-rtos/zephyr/pull/40975, Zephyr will fail to build until then.

[marc-hb]

https://github.com/thesofproject/sof/runs/4466614835?check_suite_focus=true before Zephyr 40975 was merged failed as expected:

xtensa-zephyr-elf/bin/ld.bfd: modules/sof/libmodules_sof.a(trace.c.obj):(.literal.trace_filter_update+0x0): undefined reference to `_trace_ctx_start'
xtensa-zephyr-elf/bin/ld.bfd: modules/sof/libmodules_sof.a(trace.c.obj):(.literal.trace_filter_update+0x4): undefined reference to `_trace_ctx_end'

https://sof-ci.01.org/sofpr/PR5066/build11340/build/

[246/257] Linking C executable zephyr/zephyr_pre0.elf
FAILED: zephyr/zephyr_pre0.elf zephyr/zephyr_pre0.map /srv/home/jenkins/workspace/sof_generic_build/zephyrproject/build-tgl-h/zephyr/zephyr_pre0.map : && ccache /srv/home/jenkins/xcc/install/tools/RG-2017.8-linux/XtensaTools/bin/xt-xcc zephyr/CMakeFiles/zephyr_pre0.dir/misc/empty_file.c.obj -o zephyr/zephyr_pre0.elf zephyr/CMakeFiles/offsets.dir/./arch/xtensa/core/offsets/offsets.c.obj -Wl,-T zephyr/linker_zephyr_pre0.cmd -Wl,-Map=/srv/home/jenkins/workspace/sof_generic_build/zephyrproject/build-tgl-h/zephyr/zephyr_pre0.map -Wl,--whole-archive app/libapp.a zephyr/libzephyr.a zephyr/arch/common/libarch__common.a zephyr/arch/arch/xtensa/core/libarch__xtensa__core.a zephyr/arch/arch/xtensa/core/startup/libarch__xtensa__core__startup.a zephyr/lib/libc/minimal/liblib__libc__minimal.a zephyr/lib/posix/liblib__posix.a zephyr/soc/xtensa/intel_adsp/common/libintel_adsp_common.a zephyr/drivers/interrupt_controller/libdrivers__interrupt_controller.a zephyr/drivers/timer/libdrivers__timer.a modules/sof/libmodules_sof.a -Wl,--no-whole-archive zephyr/kernel/libkernel.a -L/srv/home/jenkins/workspace/sof_generic_build/zephyrproject/build-tgl-h/zephyr -lgcc -lhal zephyr/arch/common/libisr_tables.a zephyr/soc/xtensa/intel_adsp/common/libintel_adsp_common.a -Wl,--gc-sections -Wl,--build-id=none -Wl,--sort-common=descending -Wl,--sort-section=alignment -Wl,-u,_OffsetAbsSyms -Wl,-u,_ConfigAbsSyms -nostdlib -static -Wl,-X -Wl,-N && cd /srv/home/jenkins/workspace/sof_generic_build/zephyrproject/build-tgl-h/zephyr && /usr/bin/cmake -E echo
/srv/home/jenkins/xcc/install/tools/RG-2017.8-linux/XtensaTools/bin/xt-ld:modules/sof/libmodules_sof.a(hda-dma.c.obj): error: no memory region specified for loadable section .trace_ctx

[marc-hb]

SOFCI TEST

https://sof-ci.01.org/sofpr/PR5066/build11393/build/ failed because it used Zephyr commit f8cd20fa3e74 which is not recent enough and missing intel/cavs.ld fix 9a1c5ec78eac from zephyrproject-rtos/zephyr/pull/40975

https://github.com/thesofproject/sof/runs/4555932363 builds successfully until it tries an IMX platform and then it fails.

Additional IMX fix needed, submitted in zephyrproject-rtos/zephyr/pull/41282

[lgirdwood]

Ok, lets rerun CI after Zephyr fix is merged.

[marc-hb]

SOFCI TEST

Zephyr builds are now OK
https://sof-ci.01.org/sofpr/PR5066/build11461/build/
https://github.com/thesofproject/sof/runs/4623461552?check_suite_focus=true

Everything else is green.