broadcom: Move the Broadcom drivers

Moves the drivers for Broadcom devices into
drivers/net/ethernet/broadcom/ and the necessary Kconfig and Makefile
changes.

CC: Eilon Greenstein <eilong@broadcom.com>
CC: Michael Chan <mchan@broadcom.com>
CC: Matt Carlson <mcarlson@broadcom.com>
CC: Gary Zambrano <zambrano@broadcom.com>
CC: "Maciej W. Rozycki" <macro@linux-mips.org>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/Kconfig b/drivers/net/ethernet/Kconfig
index 56ed5ec..772fb49 100644
--- a/drivers/net/ethernet/Kconfig
+++ b/drivers/net/ethernet/Kconfig
@@ -14,5 +14,6 @@
 source "drivers/net/ethernet/3com/Kconfig"
 source "drivers/net/ethernet/8390/Kconfig"
 source "drivers/net/ethernet/amd/Kconfig"
+source "drivers/net/ethernet/broadcom/Kconfig"
 
 endif # ETHERNET