Fix for QCA953X IRQ enable/disable

QCA953x chipset has same issue as QCA955X/QCA956X, fixed by refered commit below.
Unfortunately 953x is not supported in upstream. Made similar change in 953x.
    refered commit a3e485a8788da7e3c50ed22b98e6094dcf48e54b
    Author: nbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73>
    Date:   Thu Jan 15 12:19:20 2015 +0000

    ar71xx: fix disable_irq() on chained irq handlers

    Signed-off-by: Felix Fietkau <nbd@openwrt.org>

    git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43974 3c298f89-4303-0410-b956-a3cf2f4a3e73

Change-Id: I3433697e1130a7d5ffcb0519e9ed9537b476fae8
3 files changed