Remove unused imports from Camera.java

package android.hardware;

import static android.system.OsConstants.EACCES;

import static android.system.OsConstants.EBUSY;

import static android.system.OsConstants.EINVAL;

import static android.system.OsConstants.ENODEV;

import static android.system.OsConstants.ENOSYS;

import static android.system.OsConstants.EOPNOTSUPP;

import static android.system.OsConstants.EUSERS;

import android.annotation.Nullable;

import android.annotation.SdkConstant;