g2h-solo-base.inc: move common definitions to an include file

Move common definitions from the g2h-solo-[1-4].conf files to
include/g2h-solo-base.inc file, to avoid code duplication.

Signed-off-by: Mario Domenech Goulart <mario@ossystems.com.br>
g2c-base.inc: move common difinitions to the include file

Move definitions common to all g2c-* files to include/g2c-base.inc, to
avoid code duplication.

Signed-off-by: Mario Domenech Goulart <mario@ossystems.com.br>
reach-image-mfg.inc: move common image defintions to an include file

Move common definitions from reach-image-mfg-* files to
reach-image-mfg.inc files.

Signed-off-by: Mario Domenech Goulart <mario@ossystems.com.br>