kernel: update 4.9 to 4.9.44

Refresh patches.
Adapt 704-phy-no-genphy-soft-reset.patch.
Remove brcm2708/950-0005-mm-Remove-the-PFN-busy-warning.patch.
Compile-tested on brcm2708/bcm2708 and x86/64.
Runtime-tested on brcm2708/bcm2708 and x86/64.

Fixes the following vulnerabilities:
- CVE-2017-7533
- CVE-2017-1000111
- CVE-2017-1000112

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>

target/linux/generic/backport-4.9/021-bridge-multicast-to-unicast.patch

@@ -106,7 +106,7 @@ Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
  		if (prev == port)
 --- a/net/bridge/br_mdb.c
 +++ b/net/bridge/br_mdb.c
-@@ -531,7 +531,7 @@ static int br_mdb_add_group(struct net_b
+@@ -532,7 +532,7 @@ static int br_mdb_add_group(struct net_b
  			break;
  	}