samples: update ARM little-endian samples

Removed the arm-davinci sample, it does not bring much more
that the other samples.

Add an ARM uClibc EABIhf sample.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
samples: update the MIPS samples

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
samples: update the sparc sample

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>