net: fm: Support loading firmware from a filesystem

This adds a new method to load Fman firmware from a filesystem. This
allows users to use regular files instead of hard-coded offsets for the
firmware.

Signed-off-by: Sean Anderson <sean.anderson@seco.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
diff --git a/drivers/qe/Kconfig b/drivers/qe/Kconfig
index c44a81f..89a75c1 100644
--- a/drivers/qe/Kconfig
+++ b/drivers/qe/Kconfig
@@ -27,6 +27,10 @@
 	depends on FMAN_ENET || QE
 	default SYS_QE_FMAN_FW_IN_ROM
 
+config SYS_QE_FMAN_FW_IN_FS
+	depends on FS_LOADER && FMAN_ENET
+	bool "Filesystem"
+
 config SYS_QE_FMAN_FW_IN_NOR
 	bool "NOR flash"