boards: arm: drop counter from board yaml

Remove 'counter' as a supported feature on several NRF boards as these
boards fail to build tests/drivers/counter/counter_basic_api.  This is
due to the fact that we either need explicit board conf files for the
test or have the counter driver enabled via Kconfig.

Fixes #15460

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>

boards/arm/bl652_dvk/bl652_dvk.yaml

@@ -10,7 +10,6 @@ ram: 64
 flash: 512
 supported:
   - adc
-  - counter
   - nvs
   - i2c
   - pwm

boards/arm/bl654_dvk/bl654_dvk.yaml

@@ -13,4 +13,3 @@ supported:
   - ieee802154
   - pwm
   - watchdog
-  - counter

boards/arm/nrf52810_pca10040/nrf52810_pca10040.yaml

@@ -8,5 +8,3 @@ toolchain:
   - xtools
 ram: 24
 flash: 192
-supported:
-  - counter

boards/arm/nrf52840_papyr/nrf52840_papyr.yaml

@@ -13,4 +13,3 @@ supported:
   - ieee802154
   - pwm
   - watchdog
-  - counter