package/sp-oops-extract: new package

A tool for extracting OOPS/panic logs from MTD.

Tested using arm-buildroot-linux-gnueabihf toolchain.

[Thomas:
 - use sp-oops-extract instead of sp_oops_extract as the Config.in
   prompt and in the .mk file comment
 - remove @ in front of the build and install commands.
 - use $(TARGET_CONFIGURE_OPTS) instead of manually passing CC, AR,
   LD, CFLAGS and LDFLAGS.]

Signed-off-by: Doug Kehn <rdkehn@yahoo.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>