qcm2290: rename to qrb2210-rb1

It might be very tempting to define a parition config per the SoC,
however let's not fall into that trap. There are enough different
platforms which share the same SoC, but may use different bootloader or
storage configurations. Rename 'generic' qcm2290 target to use the
board-specific name, qrb2210-rb1.

Signed-off-by: Dmitry Baryshkov <[email protected]>

Author: lumag