arm/km: introduce kmsugp1 target

KMSUGP1 is from a u-boot perspective (almost) identical to KMNUSA.
The only difference is that the PCIe reset is connected to Kirkwood pin
MPP7_PEX_RST_OUTn, we use a dedicated config flag KM_PCIE_RESET_MPP7.
Such pin should theoretically be handled by the PCIe subsystem
automatically, but this turned out not to be the case.
So simply configure this PIN as a GPIO and issue a pulse manually.

Signed-off-by: Gerlando Falauto <gerlando.falauto@keymile.com>
Cc: Karlheinz Jerg <karlheinz.jerg@keymile.com>
Cc: Valentin Longchamp <valenting.longchamp@keymile.com>
Cc: Holger Brunck <holger.brunck@keymile.com>
Acked-by: Valentin Longchamp <valentin.longchamp@keymile.com>
diff --git a/boards.cfg b/boards.cfg
index a5165c8..f6a7488 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -173,6 +173,7 @@
 Active  arm         arm926ejs      kirkwood    keymile         km_arm              km_kirkwood_pci                      km_kirkwood:KM_KIRKWOOD_PCI                                                                                                       Valentin Longchamp <valentin.longchamp@keymile.com>
 Active  arm         arm926ejs      kirkwood    keymile         km_arm              kmcoge5un                            km_kirkwood:KM_COGE5UN                                                                                                            Valentin Longchamp <valentin.longchamp@keymile.com>
 Active  arm         arm926ejs      kirkwood    keymile         km_arm              kmnusa                               km_kirkwood:KM_NUSA                                                                                                               Valentin Longchamp <valentin.longchamp@keymile.com>
+Active  arm         arm926ejs      kirkwood    keymile         km_arm              kmsugp1                              km_kirkwood:KM_SUGP1                                                                                                              Valentin Longchamp <valentin.longchamp@keymile.com>
 Active  arm         arm926ejs      kirkwood    keymile         km_arm              kmsuv31                              km_kirkwood:KM_SUV31                                                                                                              Valentin Longchamp <valentin.longchamp@keymile.com>
 Active  arm         arm926ejs      kirkwood    keymile         km_arm              mgcoge3un                            km_kirkwood:KM_MGCOGE3UN                                                                                                          Valentin Longchamp <valentin.longchamp@keymile.com>
 Active  arm         arm926ejs      kirkwood    keymile         km_arm              portl2                               km_kirkwood:KM_PORTL2                                                                                                             Valentin Longchamp <valentin.longchamp@keymile.com>