linux-yocto: Adds new genericx86 and genericx86-64 SRCREVs for kernel 4.4

The only issue I found was on poky-lsb - genericx86-64 using kernel 4.4 dmesg shows the following:

[drm:gen8_irq_handler] *ERROR* The master control interrupt lied (SDE)!

I did some minimal digging and its supposed to be related to the i915 driver and it hasn't been fixed yet.

(From meta-yocto rev: 7503ddb6710e877f3eb0216f3c0a9554f92280a9)

Signed-off-by: Alejandro Hernandez <alejandro.hernandez@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta-yocto-bsp/recipes-kernel/linux/linux-yocto_4.4.bbappend

@@ -0,0 +1,11 @@
+KBRANCH_genericx86  = "standard/base"
+KBRANCH_genericx86-64  = "standard/base"
+
+KMACHINE_genericx86 ?= "common-pc"
+KMACHINE_genericx86-64 ?= "common-pc-64"
+
+SRCREV_machine_genericx86    ?= "57af322eecf5750f8f09cb8b093d613caede5c48"
+SRCREV_machine_genericx86-64 ?= "57af322eecf5750f8f09cb8b093d613caede5c48"
+
+COMPATIBLE_MACHINE_genericx86 = "genericx86"
+COMPATIBLE_MACHINE_genericx86-64 = "genericx86-64"