image_type_tezi.bbclass: set RM_WORK_EXCLUDE

The image recipes do not really support rm_work, I have observed a lot
of build issues when I modified some do_image tasks while do_rootfs not
touched, to give a example:
The stack trace of python calls that resulted in this exception/failure was:
File: 'exec_python_func() autogenerated', lineno: 2, function: <module>
     0001:
 *** 0002:buildinfo(d)
     0003:
File: 'meta/classes/image-buildinfo.bbclass', lineno: 67, function: buildinfo
     0063:# Write build information to target filesystem
     0064:python buildinfo () {
     0065:    if not d.getVar('IMAGE_BUILDINFO_FILE'):
     0066:        return
 *** 0067:    with open(d.expand('${IMAGE_ROOTFS}${IMAGE_BUILDINFO_FILE}'), 'w') as build:
     0068:        build.writelines((
     0069:            '''-----------------------
     0070:Build Configuration:  |
     0071:-----------------------

so we set RM_WORK_EXCLUDE to avoid running into those problems.

Signed-off-by: Ming Liu <ming.liu@toradex.com>

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