hwmv2 failures due to applying common overlay to board target that is not supported

[FRASTM]

Describe the bug
Ci failure when building the samples/drivers/spi_flash for the target em_starterkit@2.2/emsk_em7d

./samples/drivers/spi_flash/boards/em_starterkit.overlay devicetree error: /soc/spi@f0006000: undefined node label 'creg_gpio'

To Reproduce
Steps to reproduce the behavior:

1. west build -p auto -b em_starterkit@2.2/emsk_em7d samples/drivers/spi_flash
2. See error

Expected behavior
build successful and CI OK

Impact
CI failure on #70434

Logs and console output

-- Found devicetree overlay: ./zephyrproject/zephyr/samples/drivers/spi_flash/boards/em_starterkit.overlay
devicetree error: /soc/spi@f0006000: undefined node label 'creg_gpio'
-- In: ./zephyrproject/zephyr/build/zephyr, command: /usr/bin/python3;./zephyrproject/zephyr/scripts/dts/gen_defines.py;--dts;./zephyrproject/zephyr/build/zephyr/zephyr.dts.pre;--dtc-flags;'';--bindings-dirs;./zephyrproject/zephyr/dts/bindings;--header-out;./zephyrproject/zephyr/build/zephyr/include/generated/devicetree_generated.h.new;--dts-out;./zephyrproject/zephyr/build/zephyr/zephyr.dts.new;--edt-pickle-out;./zephyrproject/zephyr/build/zephyr/edt.pickle;--vendor-prefixes;./zephyrproject/zephyr/dts/bindings/vendor-prefixes.txt

Environment (please complete the following information):

• OS: ubuntu
• Toolchain zephyr-sdk-0.16.3
• Commit SHA aeea1d1

[nordicjm]

Failing due to using overlay which should not apply to this variant. Other failures with the same issue:

• samples: fs: fat_fs: Add RAM disk sample for nrf52840dk #69668 (esp32_wrover)
• samples: drivers: i2s: echo: sample.drivers.i2s.echo fails on nrf5340dk/nrf5340/cpuapp/ns #70283 (nrf5340dk)