brcm47xx: use separated function in upgrade to detect file type

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43708 3c298f89-4303-0410-b956-a3cf2f4a3e73
ramips: update mtd patches to apply after changes from r43700

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43709 3c298f89-4303-0410-b956-a3cf2f4a3e73