esp32c2/ecc: Remove support for inverse multiplication

On C2, inverse multiplication (division) mode uses the modular base P
instead of N making it impractical for ECC crypto calculation

components/hal/esp32c2/include/hal/ecc_ll.h

@@ -41,9 +41,6 @@ static inline void ecc_ll_set_mode(ecc_mode_t mode)
         case ECC_MODE_POINT_MUL:
             REG_SET_FIELD(ECC_MULT_CONF_REG, ECC_MULT_WORK_MODE, 0);
             break;
-        case ECC_MODE_INVERSE_MUL:
-            REG_SET_FIELD(ECC_MULT_CONF_REG, ECC_MULT_WORK_MODE, 1);
-            break;
         case ECC_MODE_VERIFY:
             REG_SET_FIELD(ECC_MULT_CONF_REG, ECC_MULT_WORK_MODE, 2);
             break;