tools: Remove relic script about NSHInitVol
tools: Remove relic script about NSHInitVol

os/tools/mkromfsimg.sh is comming from NuttX's NSH
and can't be used along TizenRT's shell TASH,
as there is no startup feature support on TizenRT,
(I assume this should be done by auto launchings apps/services).

For the record, this shell script relied
on unsupported CONFIG_NSH_* variables:

- CONFIG_NSH_INITSCRIPT, CONFIG_NSH_DISABLESCRIPT,
- CONFIG_NSH_ROMFSMOUNTPT, CONFIG_NSH_ROMFSDEVNO, CONFIG_NSH_ROMFSSECTSIZE
- CONFIG_NSH_FATMOUNTPT,
- CONFIG_NSH_FATDEVNO, CONFIG_NSH_FATSECTSIZE, CONFIG_NSH_FATNSECTORS

Note, If user need to create ROMFS partition,
check this other (same named) script:
./tools/fs/mkromfsimg.sh

Bug: https://github.com/Samsung/TizenRT/pull/1204
Change-Id: I3b6fa61e6410dbd4f8eee1ac8145bab56db391d0
Signed-off-by: Philippe Coval <ff46fec9739d31cce915aabcc3a7a2c00eee4d6c@osg.samsung.com>

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