Fix enum conversion problems in sys/dev/ath/ath_hal/ar5212/ar5212_misc.c

Fix enum conversion problems in sys/dev/ath/ath_hal/ar5212/ar5212_misc.c
and sys/dev/ath/ath_hal/ar5416/ar5416_misc.c:

sys/dev/ath/ath_hal/ar5212/ar5212_misc.c:577:24: warning: implicit conversion from enumeration type 'HAL_STATUS' to different enumeration type 'HAL_BOOL' [-Wconversion]
                return HAL_EINVAL;
                ~~~~~~ ^~~~~~~~~~

and:

sys/dev/ath/ath_hal/ar5416/ar5416_misc.c:164:9: warning: implicit conversion from enumeration type 'HAL_STATUS' to different enumeration type 'HAL_BOOL' [-Wconversion]
        return HAL_OK;
        ~~~~~~ ^~~~~~

In both cases, enums HAL_BOOL and HAL_STATUS are mixed up.

MFC after: 1 week